LED Light 5200mAh Mobile Power Bank Soybean Pattern Lithium-ion Travel Chargers Pack Color Green Li-polymer battery, Li-polymer battery is more stable and safe than Li-ion battery 4LEDs Windmill pattern indicates the power,all of the LEDs will turn on when it is full charged Afer 20 seconds no-working, it will automatically cut off power It's slim and light enough for your home and for traveling. Unique and fashion design.LED Lights designed for your traveling trip in the dark Quickly and effectively solves the low power problem for your device when travel out