The upgraded earphone has Bluetooth 4.0. Chip: CRS 8635. Supports the Apt-X Technology. It saves more power and provides high-fidelity and stereo music.It's exceptionally lightweight， comfortable， flexible， and light neckband that is made of ultra-light shape memory alloy. Eliminates the tangle wires that drive you crazy.The newly added voice control function means you need to press the voice control button on your phone， and speaking with the earphone， it supports voice control. Not ordinary hands-free call.Vibrate function . Only the left side of the earphone will vibrate when someone is calling you.The basic features are long talk/play/standby times up to 15/10/500 hours. This will connect automatically with a phone paired previously. The wireless range is 10 meters.Package Include: 1. One instructions 2. One USB charging cable