The BlueAnt S1 is a bluetooth speakerphone designed for in-car use mounted on the visor. This model features multi-point that allows two phones to simultaneously be connected at the same time, allowing passengers to answer either one when it rings. It includes a built-in speaker, but sound can also be transmitted through your car speakers via it's FM transmitter. It accepts voice to answer, and voice to call functionality, but will not read out incoming caller ID. The S1, unlike other BlueAnt models, includes a wall charger but no in-car charger.