Functions:1.Support remote control of play/pause,Website:http://www.s-ksenic.com, 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.5.When a call comes in, say “yes”to answer the call or say “no” to reject the call.6.Doze alarm function, when the driver doze, the earphone will emit rapid alarm to remind the driver.Details1. Bluetooth protocol: HSP, HFP, A2DP2. Bluetooth version: 4.03. Talking time: 4h;4. Playing time: 3h;5. Standby time : 60h;6. Charging time: 2h;7. Transmission distance: 10m;8. Weight: 8g;9. Impedance: 16ohm;10. Frequency response: 20-20kHz;11. Charging input: 5V/300-500mADesigned with Ergonomic appearance and invisible size for discreet listening to music without missing important things during work.Included an exquisite box for easy carry and put away without missing it somewhere; Light weight Bluetooth earbuds for Compact PortabilityVoice prompt Sounds like breeze, to avoid annoying sound blaster when powering on/off; Clear Sound Without Volume Control Buttons in this earbuds, Support Audio, Video, Music A2DP, enable you to enjoy clear and natural sound when calling; Elaborate Manual and humanized design for you.Up to 4 hours of continuous talk time, 3.5 hours of music time, display headset's battery level on iOS.Hassle-free Services. Notice : The bluetooth is only for one ear . Not a pair. Due to the difference of people's ear, this earphone maybe not fits everyone. If the one you get is not perfect for you, please let us know. We will find a best way to help you.