Frequently Asked Question
Have more questions? Email info@jfegwo.com. We are ready to help.
It's because it is running out of power; please use the A/C charger or car charger to recharge it. We suggest you fully charge the item every 3 months if it hasn't been used. And charge after each use.
The jumper starter has intelligent-detective function. When it is not working or it has been finished charging, it will automatically enter sleep mode to save power.
When the compressor is working, it is reasonable to become heated. It will gradually cool down after finishing working. Stop in every 10 minutes to cool down for 5 minutes.
Not suitable for large trucks and heavy vehicles(except for 4000A model); it is for the household car only. Please check the reference pressure on the wheel tires before use.
The display screen will automatically shut off in three minutes, or you can press the power button for 3 seconds to turn it off.
Because the LED light and air compressor share the same power button. You can press the power button twice to turn off the light, and then long press the button to switch back to lighting mode.
Please make sure that the power of the jumper is 50% or more, if not, charge the jumper and try again. In the winter, due to low temperature, you may need to try to start the car multiple times, but don't use more than five times; more than five times may damage the product. The jumper is only suitable for household cars, not for large trucks. If the problem still exists, please email us, we will help you solve it.
The item uses 5-segment display to mark the power level, which means it will only show 0%, 25%, 50%, 75% and 100% on the screen according to actual remaining power. For example, the actual current power is 80%, which display: 100%; after a short period of use, the real power becomes 79% and the screen display will drop to 75%.
We suggest that you can press it from another angle or place your finger in another direction, it will be easier.
It is because the air pressure is higher or almost the same as the air compressor's preset pressure, such as the tire's is 40PSI, but the air compressor's preset pressure is 35PSI, so the air compressor will not work. Please refer to page 7-Introduction of Air Compressor.
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
Please make sure charge is 50% or more, if not, charge the jumper and try again. In the winter, due to low temperature you may need to try several times more, but please note that don't start continuously more than five times, otherwise it may damage the product. This product is only compatible with 12V batteries. If you still cannot start your car, please check if there is starting malfunction on the vehicle.
If the car comes with a battery, it means that the starting current is not enough, please replace the starter with stronger power.
It may be that the two clamps touched with each other, or attach the clamps to the wrong side (Make sure red to "+", black to "-").
Please make sure charge is 50% or more,and check whether the clamps is used correctly, and the interface is clean or not. It may also be that the unit does not match the car model, or the car is hard to start even with a strter.
Circuit board problem
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
The unit is not compatible with inflating large trucks' and heavy vehicles'tires; it is capable of pumping household cars only.
It could be the current pressure of the tire is higher than or equal to the settingpressure. For instance, the tire's current pressure is 40PSI but the setting is 35PSI, the air compressor will not work under this situation.
Please check the tire label. The unit can inflate tires at less than 255 wide/R19 wheel diameter at any aspect ratio.
You can flip the switch to turn it off the after the unit stops automatically. Wait 10 minutes or more to cool the unit down before restarting manually, and the unit will continue to run for a longer time.
1) The size of your tires exceed the unit's pumping range; 2) To prevent overheating, the Over-Temperature Control automatically shuts the unit off when it gets too hot. After a few minutes, it will restart and run until it has reached the preset tire pressure.
Do not set the pressure more than the maximum, otherwise the digital screen will be damaged.
Main reason is when air compressor is working the cylinder will generate a great deal of heat, if keeping the air compressor working for over 10 minutes, it may shorten the unit's life-span and increase the risk of damage.
Yes. It comes with 4 nozzle attachments with which you can pump up many other inflatables conveniently.
Yes. It comes with 4 nozzle attachments with which you can pump up many other inflatables conveniently.
Do not use any functions while it is charging.
The item uses a 5-segment display to mark the power level, which means it will show only 25% (flashing), 25%, 50%,75%, and 100%, according to its actual power. When it's between 75% and 100%, it displays 100%, but between 50%-75% it shows 75%. For example, if the charge is 76%, it displays 100%. After being used for a short while, the actual power drops to 74%. Then the display will show 75%.
First, please note that if you recharge the unit properly, "IN" will flash on the power screen. If not, it means the unit or the charger adapter is malfunctioning. We suggest you use another AC adapter or a car charger to exclude other factors.
Maybe there is a problem with the lithium battery protection, or there is a short circuit in other ports on the motherboard.
Yes. The two USB ports can charge any of your 5V devices, such as smartphones, tablets, etc. You can use two USB at the same time.
No. It is prohibited to use any functions when the unit is being charged. Please recharge the unit before use if it has run out of power.
Long press the power button to turn on the lights. Press the button once at a time to select "strobe mode," "SOS mode," or to turn off the lights.
Probably it has run out of power; please recharge it with A/C charger or car charger. We suggest you fully charge the item every 3 months if it hasn't been used.
It will shut off automatically 2.5 minutes after it stops working, you don't need to switch it off manually.
The jumpstarter has a less than 100-watt lithium battery built-in. You can take it on some flights. Please check with your airline.
Under normal conditions, you can store our products at a minimum of -40 degrees and a maximum of 140 degrees Fahrenheit.
No, but with RoHS FC CE certification.
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
Please make sure charge is 50% or more, if not, charge the jumper and try again. In the winter, due to low temperature you may need to try several times more, but please note that don't start continuously more than five times, otherwise it may damage the product. This product is only compatible with 12V batteries. If you still cannot start your car, please check if there is starting malfunction on the vehicle.
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
The unit is not compatible with inflating large trucks' and heavy vehicles'tires; it is capable of pumping household cars only.
It could be the current pressure of the tire is higher than or equal to the settingpressure. For instance, the tire's current pressure is 40PSI but the setting is 35PSI, the air compressor will not work under this situation.
Please check the tire label. The unit can inflate tires at less than 255 wide/R19 wheel diameter at any aspect ratio.
You can flip the switch to turn it off the after the unit stops automatically. Wait 10 minutes or more to cool the unit down before restarting manually, and the unit will continue to run for a longer time.
1) The size of your tires exceed the unit's pumping range; 2) To prevent overheating, the Over-Temperature Control automatically shuts the unit off when it gets too hot. After a few minutes, it will restart and run until it has reached the preset tire pressure.
It may be that the air nozzle is blocked or the interface is not connected properly. Please don't use the extension tube, if the problem is solved after that, it means that the extension tube is not connected properly.
The unit is overloaded. Our products are generally pumped at 3.5kg, and 70PSI is 4.82kg.
Both the charging tube and the motherboard are damaged, and it is incorrect to display 100% power.
"The cylinder of the Air Compressor is damaged, caused by overload or overtime use, ""squeal"" indicates that the unit has been damaged."
Yes. It comes with 4 nozzle attachments with which you can pump up many other inflatables conveniently.
Do not use any functions while it is charging.
The item uses a 5-segment display to mark the power level, which means it will show only 25% (flashing), 25%, 50%,75%, and 100%, according to its actual power. When it's between 75% and 100%, it displays 100%, but between 50%-75% it shows 75%. For example, if the charge is 76%, it displays 100%. After being used for a short while, the actual power drops to 74%. Then the display will show 75%.
"First, please note that if you recharge the unit properly, ""IN"" will flash on the power screen. If not, it means the unit or the charger adapter is malfunctioning. We suggest you use another AC adapter or a car charger to exclude other factors."
If the unit is getting hotter, it means that it is being charged normally. Charge it for two hours and see if it will become 75%.
DO NOT disassemble or try to repair the product without professional instruction. It will void the warranty and may cause accidents.
No, please charge for it with AC&DC charger.
"This model supports AC charging to power the battery only. It will run only on DC power to inflate tires if the unit has a minimum of 25% power left. The ""JF.EGWO MAX"" and ""JF.EGWO ULTRA"" models support connections to 12V DC car chargers even when the unit is losing power."
Yes. The two USB ports can charge any of your 5V devices, such as smartphones, tablets, etc. You can use two USB at the same time.
No. It is prohibited to use any functions when the unit is being charged. Please recharge the unit before use if it has run out of power.
Long press the power button to turn on the lights. Press the button once at a time to select "strobe mode," "SOS mode," or to turn off the lights.
Probably it has run out of power; please recharge it with A/C charger or car charger. We suggest you fully charge the item every 3 months if it hasn't been used.
It will shut off automatically 2.5 minutes after it stops working, you don't need to switch it off manually.
The jumpstarter has a less than 100-watt lithium battery built-in. You can take it on some flights. Please check with your airline.
Under normal conditions, you can store our products at a minimum of -40 degrees and a maximum of 140 degrees Fahrenheit.
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
Please make sure charge is 50% or more, if not, charge the jumper and try again. In the winter, due to low temperature you may need to try several times more, but please note that don't start continuously more than five times, otherwise it may damage the product. This product is only compatible with 12V batteries. If you still cannot start your car, please check if there is starting malfunction on the vehicle.
Please make sure that the clicking niose comes from the engine or the smart clamps. The former indicates that the starting current is not enough, and the latter is normal, it will appears after connecting the battery (disappear after 3 minutes).
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
No. The unit works on cars only. The air compressor will stop running when it encounters air pressures required to inflate larger vehicle tires. If you need a jumpstarter or inflator for a truck or a heavy vehicle, please contact us for a return or an exchange.
Please check the tire label. The unit can inflate tires at less than 255 wide/R19 wheel diameter at any aspect ratio.
You can flip the switch to turn it off the after the unit stops automatically. Wait 10 minutes or more to cool the unit down before restarting manually, and the unit will continue to run for a longer time.
1) The size of your tires exceed the unit's pumping range; 2) To prevent overheating, the Over-Temperature Control automatically shuts the unit off when it gets too hot. After a few minutes, it will restart and run until it has reached the preset tire pressure.
Main reason is when air compressor is working the cylinder will generate a great deal of heat, if keeping the air compressor working for over 10 minutes, it may shorten the unit's life-span and increase the risk of damage.
Yes. It comes with 4 nozzle attachments with which you can pump up many other inflatables conveniently.
Do not use any functions while it is charging.
The item uses a 5-segment display to mark the power level, which means it will show only 25% (flashing), 25%, 50%,75%, and 100%, according to its actual power. When it's between 75% and 100%, it displays 100%, but between 50%-75% it shows 75%. For example, if the charge is 76%, it displays 100%. After being used for a short while, the actual power drops to 74%. Then the display will show 75%.
"First, please note that if you recharge the unit properly, ""IN"" will flash on the power screen. If not, it means the unit or the charger adapter is malfunctioning. We suggest you use another AC adapter or a car charger to exclude other factors."
"This model supports AC charging to power the battery only. It will run only on DC power to inflate tires if the unit has a minimum of 25% power left. The ""JF.EGWO MAX"" and ""JF.EGWO ULTRA"" models support connections to 12V DC car chargers even when the unit is losing power."
Yes. The two USB ports can charge any of your 5V devices, such as smartphones, tablets, etc. You can use two USB at the same time.
No. It is prohibited to use any functions when the unit is being charged. Please recharge the unit before use if it has run out of power.
Long press the power button to turn on the lights. Press the button once at a time to select "strobe mode," "SOS mode," or to turn off the lights.
Probably it has run out of power; please recharge it with A/C charger or car charger. We suggest you fully charge the item every 3 months if it hasn't been used.
It will shut off automatically 2.5 minutes after it stops working, you don't need to switch it off manually.
The jumpstarter has a less than 100-watt lithium battery built-in. You can take it on some flights. Please check with your airline.
Under normal conditions, you can store our products at a minimum of -40 degrees and a maximum of 140 degrees Fahrenheit.
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
Please make sure charge is 50% or more, if not, charge the jumper and try again. In the winter, due to low temperature you may need to try several times more, but please note that don't start continuously more than five times, otherwise it may damage the product. This product is only compatible with 12V batteries. If you still cannot start your car, please check if there is starting malfunction on the vehicle.
Firstly, make sure the red clamps on "+" and black on "-". It is also possible that the starting current is not enough, or the vehicle is hard to start even with a starter.
Yes, it is compatible with all 12V vehicles including truck, RV, yacht, etc. But please note it cannot be used on 24V batteries.
Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.
The unit is not compatible with inflating large trucks' and heavy vehicles'tires; it is capable of pumping household cars only.
It could be the current pressure of the tire is higher than or equal to the settingpressure. For instance, the tire's current pressure is 40PSI but the setting is 35PSI, the air compressor will not work under this situation.
Please check the tire label. The unit can inflate tires at less than 255 wide/R19 wheel diameter at any aspect ratio.
You can flip the switch to turn it off the after the unit stops automatically. Wait 10 minutes or more to cool the unit down before restarting manually, and the unit will continue to run for a longer time.
1) The size of your tires exceed the unit's pumping range; 2) To prevent overheating, the Over-Temperature Control automatically shuts the unit off when it gets too hot. After a few minutes, it will restart and run until it has reached the preset tire pressure.
Main reason is when air compressor is working the cylinder will generate a great deal of heat, if keeping the air compressor working for over 10 minutes, it may shorten the unit's life-span and increase the risk of damage.
Yes. It comes with 4 nozzle attachments with which you can pump up many other inflatables conveniently.
If you don't use any function during this period, such as USB charging or lighting, then there is a problem with the battery.
Yes. The two USB ports can charge any of your 5V devices, such as smartphones, tablets, etc. You can use two USB at the same time.
No. It is prohibited to use any functions when the unit is being charged. Please recharge the unit before use if it has run out of power.
Yes. The two USB ports can charge any of your 5V devices, such as smartphones, tablets, etc. You can use two USB at the same time.
No. It is prohibited to use any functions when the unit is being charged. Please recharge the unit before use if it has run out of power.
Long press the power button to turn on the lights. Press the button once at a time to select "strobe mode," "SOS mode," or to turn off the lights.
Probably it has run out of power; please recharge it with A/C charger or car charger. We suggest you fully charge the item every 3 months if it hasn't been used.
It will shut off automatically 2.5 minutes after it stops working, you don't need to switch it off manually.
The jumpstarter has a less than 100-watt lithium battery built-in. You can take it on some flights. Please check with your airline.
Under normal conditions, you can store our products at a minimum of -40 degrees and a maximum of 140 degrees Fahrenheit.