AGPtEK T822 Universal Bluetooth V4.1 Visor Hands Free in-Car Speakerphone with Noise Cancellation for iPhone, Samsung and All Other Smart Phones, Black A breeze to set up and working fine. Clip on your car visor with the wire and just feel nice for its sleek appearance. Designed with really intuitive buttons and phone icon, and there are also a VOL + and a VOL- to turn the sound up and down Bluetooth-enabled with vibration sensor. Designed with Bluetooth 4.1 to connect with your phone within 10m, and it can detect the vibration of your car's door by the time you get in the car. Then it will power on and connect automatically Noise Cancellation. With its DSP design, no longer did you struggle with hearing others for the very little background noise. And you can also use it to enjoy your phone's music Voice prompts and hands free driving. Speak to you with "Power ON". A call comes with Caller ID readout, all you have to do is just to answer it. Really convenient and safety for hands free driving for talkers/drivers Fully charged for 20 hours' calling. Designed with built-in lithium battery, it lasts long for your 20 hours' calling with 60 days standby time