BT65 Over-Ear Active Noise Reduction Wireless Bluetooth Headset 1. Bluetooth 5.4 chip, high-speed transmission is one step faster, no sensory delay, smoother movie and game viewing, and more stable signal. 2. High-fidelity composite diaphragm, more outstanding sound quality. 3. Lightweight body, comfortable and stress-free to wear. 4. Folding design makes the headset smaller and easier to carry. 5. Multiple bending tests, sturdy and durable, upgraded metal arm, higher durability. 6. Full mode compatibility, support Bluetooth + SD card + cable insertion. Product Parameters: 1. Bluetooth standard: V5.4 2. Wireless range: about 10m 3. Waterproof level: IPX-4 4. Frequency response: 20Hz-20KHz 5. Speaker sensitivity: 110dB+-3dB 6. Microphone sensitivity: -58dB 7. Battery capacity (mAh): 300mAh 8. Charging time: about 2 hours 9. Use time: about 8-12 hours