Model A1021 Quantity 1 Color Red + black Bluetooth Version 2.0 Operating Range 10 meter Compatibility v1.1 Microphone Yes Channels 1 Total Power 5W Impedance 2ohm Signal to Noise Ratio(SNR) >=85dB Sensitivity 80dB+/-2dB Radio N/A Supports Music Format MP3 / WAV / WMA Built-in Battery Capacity 320mAh Compatible With Cell phones tablet PC laptop and other devices with Bluetooth function. Other Features Support TF card up to 32GB Bluetooth protocol: HSP/HFP/A2DP/AVRCP pairing code: 0000; With volume control play and pause button; Built in microphone supports hands free pick up phone function; Interface: 1 x Mini USB / 1 x TF card slot. Packing List 1 x Bluetooth speaker 1 x USB cable (27cm) 1 x English user manual 1 x Carrying box