Wireless Mini Earphone Ant Series,Uibm2907 U&I

Wireless Version : V4.1+EDR Speaker Impedance : 32Ω Microphones Sensitivity : -42Db Frequency : 2.4026GHz-2.480GHz Battery : 3.7/60mAh Rechargeable Li Battery Working Temperature : -15-55°C Input : DC5V Supported file formats : A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/11.3 Wireless Distance : 33 feet or 10 meters in clear space Playing Time : 3-4 Hours Charging Time : 1-2 Hours Standby Time : 120 Hours