AKK K31 600mW 5V Out for Cam Mini AV FPV Transmitter with Race Band 5V Output for Cam, Super mini, lightweight and durable Connector: RP-SMA Female (Inner needle), Antenna Connector: RP-SMA Male (Inner hole) 40 CH including raceband, channel cover A, b, E ,F, r bands. Power off memory: replay the very last frequency band and channel. Easy to use 2 buttons and 2 LED display to change channels and frequencies conveniently.