Bluetooth speakerphone requiring no installation.Boasting Twin Speaker V Array Technology and featuring two speakers for 5 watt audio output; Supertooth HD is the most powerful sun visor carkit on the market. The built-in dual microphones pick up voices clearly, even in noisy cars. With up to 20 hours talk time and 1000 hours standby time.The SuperTooth HD Voice is equipped with a range of useful voice commands, you can check battery charge level, status of connection, call pre-dialled numbers, check your voicemail, call emergency, and answer incoming calls whilst driving safely.?The SuperTooth Hands-Free Assistant feature allows you to dictate your SMS and e-mails to the SuperTooth HD Voice and post voice messages on your Facebook wall or Twitter page. This service allows you to listen to your e-mails. 2 phones can be paired simultaneously, Text to Speech, Full Duplex, Voice Recognition Dialling (if phone supports), Charging time: 3 hours.