Features: Ultra portable design High energy capacity and reliability Multiple voltages Compatible with Mobile Phone, PDA, MP3, MP4, CD, MD, PMP, PSP, Bluetooth Headset, Digital Camera, Digital Learning Machine and Repeating Recorder, Game devices; LED chess devices, portable printer, scanner, projection devices, portable amplifier, transmitter-receiver, recorder, camcorder, color LED TV; Wireless gateway, wireless bridge, Bluetooth adapter, wireless accessories, wireless router and junction point; portable lamp, caution light, fishing light; Portable police and medical devices. Intelligent LED display: four indicators for status of remaining power and charging Energy indicator switch Built-in short-circuit, over-loading and temperature protection With USB and other standard connectors Life span: up to 500 cycles (maintains 80+% of capacity) Specification： WD21 Battery Type: Li-ion battery Charger: AC220 50HZ DC-8.5V/ 500mA Output: USB-5V/ 500mA DC-7.4V /1.5A Capacity: 14.8 Wh Charging Time: Less than 5 hrs Operating Temperature: -10℃～45℃ Size: 96mm68mm20.5mm Weight: 140g Idle Discharge: Below 30uA Color: Apple green Accessories： Portable energy WD21 Multi-function connecting line Six cellphone switching heads Five DC switching heads 8.5V/1A special charger