Check the listing for details. RIVA CAST Bluetooth Audio Transmitter New!! Buy More And Save!. Color: Black, Condition: New. Listed at 9.98 USD. RIVA CAST Bluetooth Audio Transmitter. These transmitters are great for hooking up to your old tv or home stereo system to give you a Bluetooth signal out for your Bluetooth devices. For instance you can use any pair of Bluetooth headphones to listen to your tv or stereo. You can use it to connect Bluetooth shelf speakers to you older non-Bluetooth amplifier or tv. I have used one on my older laptop to get a Bluetooth signal out so i could use my Bluetooth beats headphones on skype. I am sure these have other uses. There is a button to change from one input to the other. So you can have your tv on the optical input. And your stereo on the aux input and simply press the button to switch back and forth between them. The Riva cast is powered by a micro usb input of 5 volts. Please see photos as the box has lots of information as well as the user manual which i have included in the pictures. in the box you will find one Rivacast, one Aux to rca cable, one micro usb to usb cable, one small strip of velcro and 2 manuals. Please ask any questions prior to buying as i do not accept returns. Thank you.