... has a low battery alarm and low battery Auto power off function;4can be a key to ... 21600 mAh polymer lithium-ion batteries, super endurance, power, durable;8the classic supply time: notebook powered ... and has a low battery alarm and low battery Auto power off function;95 V, 7.4V, 9V, ... electrical equipment supplied adapter cable, adapter and mobile power supply connected to two steps, you can ...