Features: 1. Chemistry: lithium-ion cell. 2. Carry Style: Wear onto you Beit/Putinto your kitba/Hang around your neck. 3. Fuel Guage Led: 1 LED indicator( Red: power is low. Green: Power is enough) 4. Standard Accessories: 1 USB cahrger cable, 1 USB output cable and user manual. AC adaptor: Charge throug USB port Charging Model: CC/CV Charging Indictor: The LED on the battery pack is in red while caharging and in green when charge is finished. Specifications: 1. Output capacity: 7.9WH(2200mAH) Output Voltage: DC 5V Output Current: 1000mA Max. 2. Charging time: 4-6 hours. 3. Cycle life: At least 500 times. 4. Operation Temperature: -20-50 5. Dimension: 100x62x15mm. 6. Weight: 90g.