Fangrui Product Details 1. Lpt660 Wireless Folding Sports Stereo Music Bluetooth Phones Earphones Support Tf Card 2. Product Parameters: 3. Product Type: Bluetooth Headset 4. Pei Dai Style: Head-mounted 5. Function Use: Wireless Headset, Voice Headset 6. Bluetooth Version: V4.0 7. Bluetooth Mode Support: A2dp 1.2, Avrcp 1.0, Hsp, Hsf 1.5 8. Frequency: 2.402-2.480ghz, 2.4g Ism Band 9. Rf Performance: Receive Sensitivity: -84dbm; Transmit Power Up To 4dbm 10. Frequency Response: 20 Hz - 20 Khz 11. Signal To Noise Ratio (snr): 70db; 12. Total Harmonic Distortion Rate (thd) 0. 13. Power Indicator: Blue Light 14. Headphone Charging: Rechargeable 400mah Lithium Battery 15. Charging Port: Mini 5-pin Usb Charging Interface 16. Normal Charging Time: About 2.5 Hours 17. Call Duration: Up To 10 Hours 18. Standby Length: Up To 250 Hours 19. Operating Temperature: -20oc - 55oc 20. Other Features: Support Status Indicator, Charging Indicator Display 21. Product Accessories: Headphones, Usb Charging Cable, Manual 22. Product Packaging Size: 17.5*9*13cm 23. Easy To Make A Phone Call, Using 360-degree Sound Pickup Technology, With A Samping Frequency Range Of 30-16000hz, Can Steadily Convert Sound Into Electronic Signals, And Sound Clear Without Noise. 24. Comfortable Ear Cover, Good Anti-noise Function, The Inner Part Of The Ear Cover Is Made Of Soft Sponge And Leather. The Silent Stereo Sound Experience. 25. Built-in Lithium Battery, Up To 10 Hours Of Talk Time, 250 Hours Of Standby Time, Easy To Use.