Characteristics and Interoperability BT, 2.4G, and Wired TRRS 3.5mm connections 50 mm speaker diameter; 4 x 1.5 mm microphone; Omni-directional microphone direction; 15–30,000 Hz frequency response Sensitivity of Speaker: 114 ± 3 dB Sensitivity of Microphone: -38±2 dB Impedance of Speaker: 64 Ω±15% Impedance of the microphone: ≤2.2 ΢Ω(μax) 15 m Bluetooth range 2.4G Ten meters of wireless range Maximum Playtime of 40 Hours Max. Standby Duration of 300 Hours 400 mAH of battery capacity Approximately two hours for charging 180±3 g in weight