ABS Plastic round wireless speaker. Power/Technology: Rechargeable Lithium-Ion battery: 3.7V, Capacity: 300 mAh; Input: DC 5V/180mA; Output/Power: 3W; Work current: 50mA; Impedance: 4Ω; Frequency response: 20Hz-20KHz; SNR: ≥70dB; Sensitivity: 85dB +/-2dB; Transmission range: 10M (30 feet); Wireless V4.1. Device must be charged prior to first use. Charge time varies by device. Minimum charge time: 2 hrs. Playback time: Approx. 90 min (depending on volume and usage). Charging cable and instructions included. FCC approved.