Got2b G21100 Handsfree/Bluetooth Installed Carkit for 1" Circle Mount Installs In Open Cigarette Lighter Housing or 1" Circle Blank In Vehicle Pairing Easy without Pressing any Button High Powered Amplifier Output and Uses the Vehicle's Speakers Automatic Loudspeaker Mute and Built In MIC with Mute Function Pairs Up to 4 Phones; Auto Connected to the Last Paired Phone