Earphone Specifications Ambient Temperature: -20/+60C Earphone Version: V4.1 Transmission Distance: 10m Battery Capacity: 100mAh37V Profile Support: HSP HFP. A2DP. AVRCP Stan-by Time: 200h Driver Specification Talk Time: 6h Music Play Time: 6h Sensitivity: 90d B+3dB Charging Time: 2h Impedance:162±15% Charging Voltage: DC 5V Frequency Range: 2.402G-2480G Frequency Response: 20-20000Hz