"Bluetooth CONFERENCE SpeakerPhone For In-Car & Home Use like Conference Phone. Advanced Built-In Mic. No More Wire! Built-In Rechargeable Li-ion Battery - Nokia phone battery compatible, Class 2, Version 1.2 Talk Time: 10-12 hrs.; Standby Time: 380 hrs. DIA.: L 13.5 cm. x W 5.0 cm. x H 2.3cm"