LN-BT02 Stereo Smart 4.0 Bluetooth Audio Receiver Module Feature: Bluetooth stereo dual speakers,pairing with a Bluetooth phone or computer,can wirelessly listen to music,but also as a wireless phone hands-free calling. Supported operating volume up/down and play / pause. Bluetooth devices after successful connection,when again open the Bluetooth will automatically connect . Product design parts layout, smart stereo Bluetooth receiver. Bluetooth core using high quality chips, built-in enhanced signal transmission circuit.Bluetooth receiver stable, built ANC echo cancellation and AEC noise cancellation circuit. Handsfree no echo and noise. Technical Reference: Bluetooth specification: Bluetooth V4.0 + EDR Transmission power: CLASS2 Bluetooth protocol: HFP V1.5 A2DP (1.1), AVCRP1.3 Hands-free agreement: 1.6 Transmission distance: 15M Power supply voltage: 3.6-30V Frequency response: 80Hz-22KHz SNR: >80dB Output power: >600mV Stereo separation level:> 50dB Channel balance: <2dB Package included: 1 x LN-BT02 Stereo Smart 4.0 Bluetooth Audio Receiver Module