ABS plastic case speaker Connects to your mobile device using wireless technology Includes rechargeable Lithium-polymer battery that charges through micro USB port (cable provided) Power/Technology: Rated Impedance: 4 Ohm; Rated Power: 2W; Speaker: 0.9 inches; Frequency response: 180HZ-16KHz; SNR: = 90d; Distortion: < 1% While Supplies Last!