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1.Can I use the unit to jump start my yacht, mower or other battery-equipped items?

Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.

2.Why doesn't the jumper start my car?

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.

3.There is a clicking noise when using and the car does not start successfully.

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).


1.Can I use the unit to jump start my yacht, mower or other battery-equipped items?

Yes. As long as your item is 12V battery-equipped, the unit is capable of jump starting it.

2.Can the item jumpstart or inflate a large truck or a heavy vehicle?

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.

3.What size tire is suitable for inflation?

Please check the tire label. The unit can inflate tires at less than 255 wide/R19 wheel diameter at any aspect ratio.

4.I understand that the unit will turn itself on and off because of its overheating protection, but I want it to run longer. What should I do?

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.

5.Why does the unit stop automatically during inflation?

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.

6.When using air compressor to pump tires, why do I need to stop in every 10 minutes to cool down the inflation for 5 minutes?

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.

7.Can I use the unit to pump other infiatables, such as a kayak, air mattress, toys, etc.?

Yes. It comes with 4 nozzle attachments with which you can pump up many other inflatables conveniently.


1.Can I charge for my phone while the unit is being charged?

Do not use any functions while it is charging.

2.Why does the power display rise or fall rapidly? For example, it jumps from 100% and drops to 75%.

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%.

3.Why can't I recharge the unit?

"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."

4.Will the air compressor still work if its battery is dead and you recharge it with a 12V DC car 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."


1.Can I charge my iPad, iPhone and other electronic devices with the unit?

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.

2.Can I charge devices with USB ports when the unit is being charged?

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.


1.How to turn on the LED lights?

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.


1.Why isn't the jump starter switched on when I press the ON button?

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.

2.How to switch off the unit?

It will shut off automatically 2.5 minutes after it stops working, you don't need to switch it off manually.

3.Is the unit airline approved? Can I take it on a commercial flight?

The jumpstarter has a less than 100-watt lithium battery built-in. You can take it on some flights. Please check with your airline.

4.What are the best temperatures for storage?

Under normal conditions, you can store our products at a minimum of -40 degrees and a maximum of 140 degrees Fahrenheit.

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