Bluetooth, 2.4G, Wired TRRS 3.5mm, USB 7.1, 50 mm Speaker Diameter, 4*1.5 mm Microphone Omni-Directional Microphone Direction and Frequency 15–30,000 Hz of response 114 ± 3 dB is the speaker's sensitivity. Sensitivity of the microphone: -38±2 dB 64 Ω±15% is the speaker impedance. Impedance of the microphone ≤2.2 ΚΩ (Μax) 2.4G Bluetooth Range: 15 m Ten meters is the wireless range. Duration of Play: Up to 40 hours Maximum Standby Duration: 300 Hours 400 mAH battery capacity Charge Time: About Two Hours 180±3 g in weight