The SimplyASP Tech Portable Mini Square Wireless Speaker features Bluetooth 2.1 + EDR technology for wireless music streaming and a built -in microphone for crystal clear hands-free calls. Sleek cube design for easy carrying and also delivers rich audio performance. Elevate your music to the next level with this compact design and excellent performance. Specification: Bluetooth 2.1 + EDR. Input mode: Bluetooth, AUX. Impedance: 4 Ohm. Power output: 3W RMS. Speaker diameter: 400mm. Distortion: = 0.2%. S / N Ration: = 85dB. Sensitivity: 80dB ± 2dB. Frequency response: 20Hz-20000Hz. Battery capacity: 400mAh. Product size: 50X51X52mm.