Specifications:
Bluetooth V5.0
Radio frequency range: 2.402 GHZ ~ 2.480 GHZ
HFP, A2DP, AVRCP Bluetooth compatible
Transmission range: 10 m (32.8 ft)
Frequency response: 20 Z - 20 KHZ
Driver: 40 mm (1.57”)
Impedance: 32 Ω
Driver frequency: 20 Hz ~ 20 KHz
Sensitivity: 107dB+/-3dB
Battery: Rechargeable Li-Ion, 3.7 V, 250 mAh
Power Supply: DC5V 0.5A
USB charging interface
Charging time: 2.5 hours
Battery life: 12 hours (with volume at 50%)