Material: Metal

BT Protocol: 2.1

Channel: 5.1

Working Voltage: 3.3V-4.2V

Charge Voltage: 5V±5%

Charge Current: 500mA max

S/N Ratio: >95dB

Frequency Response: 20Hz-20KHz ±3dB

Distortion: &It; 03% (1KHz, A weighting)

Battery: 2000mAh

Microphone color: black