JR-T03S is the model. Version V5.0 of Bluetooth Range of communication: ≤10m (normal setting) Response frequency: 20 Hz–20 kHz Sensitivity: SPL +/ -3dB 103dB Rate of distortion: ≤5% Protocols supported: HSP, HFP, A2DP, and AVRCP 16 Ω is the impedance. Between 3.3 and 4.2 V 5 mw of power The charging bin's battery capacity is 400mAh. 45mAh is the earphone battery capacity. About three hours of music at 80% volume About three and a half hours Time on standby: roughly 80 hours Bin for charging Wireless charging time for earphones: approximately three hours; USB charging time: approximately one hour Touch control instead of button control Product weight: approximately 41g Product dimensions (charging bin): 44*22*53.8mm