The Scosche BTHFVF CellVisor hands free wireless speaker phone allows you to safely answer, end, transfer or ignore cell phone calls with one touch. The built-in rechargeable lithium-ion battery provides a generous 8 hours of talk time along with up to 400 hours of standby time. Set phone numbers into the CellVisor and make quick and easy phone calls using the one touch dialing feature. The built-in DSP echo cancellation ensures crystal clear phone conversations during calls, even inside noisy vehicles. The CellVisor automatically pairs with your cell phone or compatible Bluetooth device once Bluetooth is set to “on” mode and it is linked up with your mobile device. Compatible with popular mobile phone's devices such as iPhone, Samsung Galaxy, Android, and most Bluetooth cell phone devices. Use the included sun visor mount to keep the CellVisor secured and out of the way. Power the CellVisor with the USB power cable and car adapter which plugs into your vehicles 12V outlet.