Specification:<br />1. Drive: 40 mm<br />2. Impedance: 32 OHM<br />3. Bluetooth version: Bluetooth v4.1 + EDR<br />4. Power Level: CLASS II<br />5. Output Power: 30mW<br />6. Bluetooth distance: 10 meters barrier<br />7. Frequency response: 20-20000 Hz<br />8. Operating voltage range: 3.0V-4.2V<br />9. Microphone sensitivity: -42dB<br />10. with A2DP / AVRCP high-quality stereo audio transmission and remote control protocol<br />11. Powerful noise noise cancellation circuit (Active Noise Reduction)<br />12. Wired and Bluetooth automatically switch to support audio input<br />13. Charging time is about 1 hour (Power indicator Charging)<br />14. Dimensions: Diameter length 20MM. Width 15MM. 18mm high<br />15. Weight about 4g<br />16. Talk time About 4 hours<br />17. Music for about 3 hours<br />18. The standby time is about 3-4 days<br />19. Compatible: Compatible with Android・ Apple・ Microsoft・  (IOS cell phone has power display) <br /><br /><br />Package Included:<br />1 x Bluetooth Earphone<br />1 x USB cable<br />1 x User manual<br /><br /><br />* Brand new and high quality.<br />* 4.1 smart chip・Efficient transmission speed.<br />* Compact・ ultra Light Design Stereo Bluetooth Headset・ Portable And Easy To Carry.<br />* High-fidelity sound quality・ Wireless songs enjoy<br />* Voice report number・ low power remind・ Connect/disconnect remind・ Boot off prompts.<br />* Allows you to conveniently answer calls while driving.<br />* Supports Two M