Model MKBS-004 Quantity 1 Color Silver Bluetooth Version v3.0 + EDR Operating Range 10 meter Compatibility Cell phone tablet and other device with Bluetooth function. Microphone Yes Channels 2.1 Total Power 2.0W Impedance 4ohm Signal to Noise Ratio(SNR) >= 90dB Sensitivity 450mV Radio N/A Supports Music Format N/A Power Supply Built-in Battery Built-in Battery Capacity 400mAh Other Features Frequency response: 160Hz~20kHz; Support phone call hands free. Certification CE Packing List 1 x Mini Bluetooth speaker 1 x USB cable (72cm) 1 x Carrying bag 1 x Strap 1 x Chinese / English user manual