Escene Bt&Ehs Wireless Headset Module (BWM36) - Bluetooth Features, Support Wideband Audio, Operating Distance: 10 meters, Optimum Distance: 3~5 meters (6~8 feet), Answer incoming calls through Bluetooth Headset, Terminate calls Through Bluetooth Headset, Adjusts the Volume through Bluetooth Headset, Transmitted power: Class 2, Bluetooth Frequency Range: 2.402GHz-2.480GHZ, Symbol rate: 3Mbit/sec