Features volume control and microphone on flat ABS Plastic panel Micro USB charging cable included. Power/Technology: Rechargeable Lithium Polymer battery: 3.7V; Capacity: 50 mAh; Input: DC 5V/200mA; Work Current: 30 mA; Charge Current: 30-150mA; Transmit power: 98-108db; Frequency response: 20-20000hz; Transmission Range: 10m (30 ft); Wireless 4.2 Item must be charged prior to first use. Charge time varies by device, minimum 2 hours. Playback time: approx. 1-2 hours depending on use. Features red LED indicator light