You hear crys from children family's conversations and friends' instruction... ...Through the journey of your life you hear sounds of love. In the day you drive and work while at night you enjoy secret chat with your relatives and friends.Vehicle blue-tooth earphone brings you joyful feeling. Built in high delifition camnera - enjoy easy operation and high quality cdonversationInfinite compatibility - enjoy flexibility on any smart mobilephoneUltra-long standby time - enjoy smooth conversaitionBlue-tooth transportation-enjoy long distance amusementAutomatic power-off when you get off the car - enjoy automatic disconnect when it is beyond the usable scope Features: high quality conversationsmart compatibilityutra-long standby timeconnect 2 mobilephones simultaneouslyautomatic power-off when you get off the car Technical parameters: Product specification: Product name: Version 3.0 Operation frequency scope: ISM2.4GHz to2.4GHz Blue-tooth profile supported: SpeakerphoneHands-Free Profiles Emission power: Class2 Wireless connection scope: 0-10m Charger output norm: DC5-6V 400MA Built-in chargeable battery: 3.7V 650MA(#BL-5B) Normal charging time: 2-3h Hands-free converstion time: roughly 17h Standby time: 720h/3 days Hands-free size: Vehicle Blue-tooth Hands-free Car kit: L11.5CM*W4.5CM*H1.4CM(hook excluded)