Product details of RECRSI RE-NY031 Bluetooth Wireless,waterproof Neckband with 50 Hours Charging BackupBrand name: RECRSIModel: RE-NY031Wireless Version: 5.1Stabdby Time: 50 HoursDuration Time: 40 HoursCharging Power: 120mABrand name: RECRSIModel: RE-NY031Wireless Version: 5.1Stabdby Time: 50 HoursDuration Time: 40 HoursCharging Power: 120mACharging Type: Micro USBSensitivity: 102dB at 1kHzImpedance: 16 OhmFrequency Range: 20 Hz-20KHzSupported Profiles: HSP, HFP, A2DP, AVRCPMic Sensitivity: -42dB