Features:
Super easy to use: You just need to put the Boscam BOS G20 into the back of Gopro3 / 4， then it works when the camera turned on
Wireless transmission: Boscam BOS G20 can sent the audio / video of Gopro in form of analog signal to the monitor of receiver(such as RD2， RD4 and video watch)

Brand: Boscam
Item Name: BOS G20 Video Transmitter
Effective distance is about 300m
Usage: for Gopro Hero3 / Hero4
Size: 5.92 x 4.15 x 1.58cm
Frequency: 5.8G