There are mixed reviews on this type of setup. Expensive ones can cost
$250 and above. The cheaper ones $100 or less. You still need a rear amp
and transmitter, and need to receive signals from your regular receiver - if
you want to convert wired speakers to wireless. The more money you spend,
then the better it may be. Do a search on Amazon for Kenwood RF-U6100,
Acoustic Research ARW20, JBL WEM-1, Rocketfish R-WHTIB