Tritton AX Visor Bluetooth Handsfree Car Kit High performance built-in speaker and dual microphone; hangs from visor in your car Senses vibration of car and connects automatically to phone when engine is switched on OLED display for caller ID; can be charged by included car charger or via USB Supports Headset and Handsfree profiles for handsfree function with Bluetooth phones Up to 15 hours of talk time and 400 hours of standby time