Fangrui Product Details 1. Zealot B39 Wireless Bluetooth 5.2 Headphone 2. Features 3. Foldable Design, Light And Beautiful, Soft And Skin-friendly, Comfortable To Wear. 4. Use Bluetooth 5.2 Chip To Improve The Anti-interference Ability Of The Chip In Complex Environments, With Lower Power Consumption And Faster Transmission. 5. Built-in Large-capacity Lithium Battery Brings Long-lasting Battery Life, And Is Equipped With A Low-power Bluetooth Chip To Get Rid Of Battery Anxiety. 6. The Headset Is Equipped With Al Call Noise Reduction Algorithm, Which Accurately Picks Up Human Voices And Reduces Environmental Noise. No Matter Where You Are, Voice Calls Are Clear And Smooth. 7. The Use Of Intelligent Noise Reduction Technology Can Reduce Environmental Noise. The Fully Enclosed Design Has Better Sealing And Can Easily Cope With The Complex Noise Environment In Life. 8. Parameters 9. Bluetooth Version: V5.2 10. Connection Range: 10m 11. Speaker Size: 40mm X 2 12. Charging Voltage: Dc 5v 13. Signal-to-noise Ratio: 90db 14. Talk Time: About 8h, Music Playback: About 5-10h, Standby Time: Greater Than Or Equal To 30 Days, Charging Time: About 5h 15. Frequency Range: 20hz-20khz, Distortion: Less Than Or Equal To 16. Battery Capacity: 300mah