Wreless Version: EDR Wireless V5.1+ 2.4 GHz is the frequency. 15 meters is the transmission distance. 5V/1A is the charging voltage/current. Time on standby: 120 hours. -10 to 50°C is the working temperature. Hon impedance: 3202 c13.2 mm A2DP13/HF01.6/HSP1.2/AVRCP 1.6/D11.3 is the support protocol.