Power Level Display: Long press a button on battery for 3 seconds to check battery power levels. Every indicator means 25% power. When the remaining power of the battery is low and the last green light blinks. Please recharge it as soon as possible.
USB Output: When the battery is inserted, use the USB-C charging cable to connect a USB device to the flashlight to begin the output process. During the output process, the green indicators will turn on constantly to display the power level. The last green indicator will start to blink when the power level is low.
Battery Recharging: When the battery is inserted, use the USB-C charging cable to connect an external power source to the flashlight to begin the charging process. During the charging process, the green indicators will blink to display the power level. When the battery is fully charged, all 4 green indicators will be constant-on.