• Made of ABS Plastic • Power/Technology: Rechargeable Lithium-Ion battery: Capacity: 400 mah / 3.7V; Output: 3W, Work current: 200-600mA; Standby: 10uA; Sensitivity: =70dB; Frequency response: 150Hz - 10KHz; Wireless V 5.0; Transmit range: 10m (30 ft). • Playback time approx. 4 hrs. depending on use. • Must be charged prior to first use, min 2 hours. • Includes instructions and charging cable. • Includes microphone for answering and making phone calls. • FCC Approved