Samsung Galaxy S7 edge Wireless Charging Battery Pack Cover, Black 3100mAh capacity for extended use and multiple charges Supports pass-through charging, the LED by the volume buttons should be lit blue and the white LEDs representing battery life of the battery pack should be blinking (how many are lit represents current charge of battery  when all 4 are solid, pack is fully charged), If the phone is not charging while unit is plugged in, press the power key by the 4 LED lights to start charging Power key to check battery life or activate wireless charging (single press), hold down for 3 seconds to cancel wireless charging to conserve battery Will automatically stop wireless charging when phone reached 100% to conserve battery, click the power button again to reactivate wireless charging Please Note: Kindly refer the User Manual before use.