Bluetooth Version: V5.0 Mic Size: 6.5*5.0mm Mic Sensitivity: -44 ±3db Mic Impedance: 2.2K Speaker impedance: 32 �?�±15% Speaker Diameter: 40mm Transmission Distance: about10meters Frequency: 20Hz~20kHz Battery Capacity:300mAh/5V Charging Time:2hours Standby Time: About300 hours Bluetooth Duration: About20hours
