Bury Technologies Universal System 8 Base Sets are compatible with all System 8 Take & Talk and BT Freedom Premium cradle. Just choose the base unit that best suits your needs. Once the base unit is installed you can instantly change cradles without any tools or set up changes. CarTalk is the heart of our most popular Universal System 8 hands free car kit. Once this base unit is installed you can instantly change cradles without any tools or set up changes. Cradles available to suit over 200 different models of mobile phones and PDA devices. Features include radio mute, choice of external speaker (incl) or car audio speaker, external antenna connection, full duplex operation.