GoolRC TS832S 40CH 5.8G 600mw Wireless Video Transmitter for RC FPV Aerial Photography This is 40-channel transmitter of 5.8G 600mW A/V wireless system. This item is only can transmit the picture and video without voice Digital phase-locked loop circuit, no channel drift issues Two switching buttons: CH button for frequencies channels switching, FR button for frequencies bands switching Wireless transmission distance up to 800 meters without any obstacles and interfering signal