Connection BT,2.4G, Wired TRRS 3.5mm Speaker Diameter 50 mm Microphone Diameter 4*1.5 mm Microphone Direction Omni-Directional Frequency Response 15-30000 Hz Speaker Sensitivity 114 ± 3 dB Microphone Sensitivity -38±2 dB Speaker Impedance 64 Ω±15% Microphone Impedance ≤2.2 ΚΩ(Μax) Bluetooth Range 15 m 2.4G Wireless Range 10 m Playing Time Up to 40 Hours Standby Time Up to 300 Hours Battery Capacity 400 mAH Charging Time Approx 2 Hours Weight 180±3 g