Thanks to Text To Speech technology, the SuperTooth VisorVoice will say the name of the person who is calling. To answer a call, simply say OK. Keep your eyes on the road and your hands on the wheel. Standby: up to 800 hours. Talk time: 15 hours. Bluetooth version 2.0 No installation - instant clip to visor. 2 year manufacturer warranty. Specification: Text to Speech. Automatic phone book transfer. 6 language options. Full automatic reconnection. Full DSP noise and echo cancellation. Full Duplex and allowing both parties to talk simultaneously. Voice control to pick up the call.