... three 18650 li-ion rechargeable batteries, fits for charging all kinds of phones, laptop, iphone/ipod/ipad, notebook ... press1, shows the electricity power and turn the product on. Press2, lighting. It helpful for your travelling and camping, no worry the darkness Press3 ... -discharging & circuit shortage which can prolong the life-span of you battery and more safety7. Standby current≤150uA8. OEM ODM ...