• Rechargeable Lithium Polymer Battery: 180 mAh/3.7V; Input: 5V/1A; Output: 74 wh; Bluetooth 3.0; Transducer: 9U; Driver unit: ?40mm; Frequency response: 20~20KHz; Impedance: 32 ? ohsm; Sensitivity: Microphone- 105±3dB - Speaker- -58±3dB; Distortion: ?1% at 1KHz; Rated power: 10mW; Max power input: 20mW; Transmission Range: 10m (30 ft) • ABS Plastic Bluetooth powered over ear headphones with build in microphone for hands free calls. • Approx. 8 hours of playback time. • Includes USB charging cable. • Charge time varies by device. Must charge prior to first use. • Compatible with most Bluetooth enabled devices. • Instructions included • FCC Approved