ABS plastic; Round wireless speaker; Power/Technology: Rechargeable Lithium-Ion battery: 37V, Capacity: 300 mAh; Input: DC 5V/180mA; Output/Power: 3W; Work current: 50mA; Impedance: 4?; Frequency response: 20Hz-20KHz; SNR: ?70dB; Sensitivity: 85dB +/-2dB; Transmission range: 10M (30 feet); Wireless V41; 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; Product Size: 2 d x 2.25 dia.; Shipping available to contiguous U.S. addresses and Canada via Ground only.  Cannot ship via Air, Internationally or to Alaska, Hawaii, Puerto Rico and any other small U.S. island territory.