Model A1021 Quantity 1 Color Silver + black Bluetooth Version Bluetooth v2.0 Operating Range 10 meter Compatibility Compatible with Bluetooth v1.1 / v1.0 Microphone Yes Channels 1 Total Power 5W Impedance 2ohm Signal to Noise Ratio(SNR) >=85dB Sensitivity 80dB +/-2 dB Radio N/A Supports Music Format MP3 / WAV / WMA Power Supply Built-in Battery Built-in Battery Capacity 320mAh Compatible With Cell phone / computer / tablet PC with Bluetooth function Other Features Default PIN: 0000; Supports HSP / HFP / A2DP / AVRCP protocol; Interface: Mini USB /TF card slot; Supports TF card up to 32GB; Supports hands-free; Charging voltage: DC 5V / 500~1000mA; Charging time: About 3 hour; Power: 5W; Speaker: 1.5 x 1; Frequency response: 100Hz~18kHz; Distortion: THD Packing List 1 x Bluetooth speaker 1 x USB cable (27cm) 1 x English user manual 1 x Case