1. Wireless bluetooth headset 2. Bluetooth V4.1 technology: faster transmission 3. Built-in microphone: support hands-free calling 4. Wire control: support volume adjustment, song switching, answering calls 5. Support caller number voice broadcast 6. Noise Cancelling Sound: Provides clear speech and undisturbed music 7. Support automatic shutdown without signal 8. Built-in 120mAh lithium battery, low power consumption and long working time 9. Sweat-resistant design 10. Ergonomic earplug design, comfortable to wear 11. Ear-hook design, more secure to wear