Magnet Headphone, Bluetooth Wireless Stereo Headset, Sweat-proof Sports Earphone with Microphone, In-ear Earbuds, Supply by USB Cable, Warning Tone Function Fashion Magnet Anti-lost Design : With magnetic technology, the earbuds can be adsorbed together. You can wear it as necklace, avoiding losing Bluetooth 4.1 and effective distance is about 10 meters ( Depend on environment, mobile phone and headset line distance) LED Indicator Light : the light will on when you are matching the digital equipment or charging the headphone. It will display the batterys capacity on your smart phone Long Battery Life: About 2.5 hours for charging, you can have 6 hours music time, 8 hours talk time and 100 hours standby time Built-in Microphone and CVC6.0 Cancellation: You can have a call easily when your hands are busy