Portable, triple folding wireless keyboard of ABS plastic for all-sizes of tablets and smartphones Built-in rechargeable lithium polymer battery USB to Micro USB charging cable included Charge time varies by device (minimum 2 hrs). Charge required prior to first use. Power/Technology: Rechargeable Lithium polymer battery. Capacity 130 mAh; Input: 5V Output: DC 5V by USB port, DC 3.9V by battery; Work current: 3 mA; Standby current: 200 uA; Transmit power: 0dbm Frequency response: 2402-2480mHz; Transmission range: 10m (32 feet). Item works with most wireless enabled devices including Android, Windows and IOS such as iPhone® by pairing with device in Wireless mode Instructions included CE and FCC approved