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https://www.car-ku.com/products/24000mAh-Jump-Starter-Epower-40.html
How to operate key on CARKU EPower-40 jump starter?
Test Key
when you press test key, you will know the power usage and unlock it.
12V/24V Key
It is an alternative to start 12V or 24V Vehicles.
when you press 12V button till three seconds, 12V delicator will be lit up to start 12V vehicles.When you press 24V button till three seconds, 24V delicator will be lit up to start 24V vehicles.
12V/24V Indicator
a. If 12V or 24V indicator is on all the time, EPower-40 jump starter connects 12V or 24V vehicles battery well, and directly jump start vehicles.
b. If either 12V or 24V indicator is flashing, EPower-40 jump starter needs to press 12V or 24 key till 3 seconds.when 12V or 24V indicator is on all the time, EPower-40 jump starter can jumpstart vehicle battery in 30 seconds.
c. If 12V or 24V indicator is flashing alternately, EPower-40 jump starter can't identify vehicle voltage,so it need to press 12V or 24V key correctly till 3 seconds. When 12V or 24V indicator is on all the time, it can jumpstart vehicle battery in 30 seconds.
d. If 12V or 24V indicator are flashing at the same time,it connects vehicle battery in wrong way, please check and correct it.Indicators:
the power indicators will be flashing one by one repeatedly if charging. the number of lighting indicator will show the usage of battery of jump starter charger. the five indicator will be lit on to die out if in full charge.The NO. of Indicators all off 5 flashing 1 on 2 on 3 on 4 on 5 on The Percentage of power usage 0% 10% 20% 40% 60% 80% 100% 
Vivi
inquiry@carku.com
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