Functions:1. Support remote control of play/pause, next song/last song,volume up/volume down,pick up/hang up/ reject the phone calls,last number redial.2. Pause the music & play back automatically when receives an incoming call.3. Connect two cellphones at the same time.4. Display headphone's battery on Apple devices.5. Automatically turn off without connection for 30 min.Details1.Bluetooth protocol: HSP, HFP, A2DP2. Bluetooth version: 4.03. Talking time: 4h;4. Playing time: 3h;5. Standby time : 100h;6. Charging time: 2h;7. Transmission distance: 10m;8. Weight: 6g;9. Impedance: 16ohm;10. Frequency response: 20-20kHz;11. Charging input: 5V/300-500mAProduct DescriptionHandsfree call and listen Music, Freely switches between music and calls. You can play, skip and pause music, control volume and pick up call calls. Waiting for a call, no need to disconnect. your Bluetooth headphones the music will go automatically to pause when an incoming call comes in, will go back to music automatically when you hang up.