SF-A01 Video Transmission Module
From Wiki
Technical Specifications
Features
The blue LED indicates the frequency group. If the indicator A lights up, it indicates that the current frequency group is A group.
The green LED indicates the channel. If the indicator CH1 lights up, it indicates that the current channel is CH1.
Dimensions: 28.5 x 22.4 x 7.7 mm
Model: SF-A01 (5.8G, 40ch); Weight: 6.9g