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Specification:1. Drive: 40 mm2. Impedance: 32 OHM3. Bluetooth version: Bluetooth v4.0 + EDR4. Power Level: CLASS II5. Output Power: 30mW6. Bluetooth distance: 10 meters barrier7. Frequency response: 20-20000 Hz8. Operating voltage range: 3.0V-4.2V9. Microphone sensitivity: -42dB10. with A2DP / AVRCP high-quality stereo audio transmission and remote control protocol11. Powerful noise noise cancellation circuit (Active Noise Reduction)12. Wired and Bluetooth automatically switch to support audio input13. Charging time is about 1 hour (power indicator Charging: blue light lights, fully charged: blue light goes out)14. Dimensions: Diameter length 20MM. Width 15MM. 18mm high15. Weight about 4g16. Talk time About 4 hours17. Music for about 3 hours18. The standby time is about 3-4 days19. Charging Power: DC5V Power Interface [the hole] (computer USB port, mobile phone charger, car charger)20. Compatible: Compatible with Android, Apple, Microsoft, Symbian 99% of with Bluetooth cell phones(IOS cell phone has power display)
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