A4tech BH220 Wireless Headset Headphones (White)

Bluetooth Version: v5.3

Operating Range: Up to 10m (32 feet)

Built-in Battery: 400mAh Lithium Battery

Playback Time: 40H

Speaker Unit: 40mm Hybrid Diaphragm

Frequency: 20Hz - 20KHz

lmpedance: 32ohm

Sensitivity: 100dB

Mic. Type: ENC Omni-Directional

Frequency: 100Hz - 10KHz

Sensitivity: -42dB

USB Type-C Charging Cable: 50 cm