The st121whdst hdmi wireless extender kit lets you extend an hdmi audiovideo signal wirelessly up to 50ft 15m using whdi technology a complete end to end solution that includes both the hdmi wireless transmitter and receiver with support for digital audio and video resolutions up to 1080p the hdmi extender allows for wireless video extension with no loss in hdmi quality featuring a small key style transmitter with usb power the wireless extender offers maximum portability and can