This FPV transmitter doesn't need extra installation. Attach it directly to the GoPro camera.

It can get the video from the GoPro and has a video input to which you can attach other devices.

Super light: 7 grams
With 32CH, and a new LED shows you the frequency you are working at.
Direct connect to GH3 and GH3+
Works on a 3.7V single-cell battery; you can use a tiny camera to support it for a long time, i.e., a 500mAh battery works for 1.3 hours.
SMA connector; we suggest you choose the short type of Clover Leaf Antennas.
A soft 4-pin cable will be included for FPV use. You can connect other video sources.
Great to work with DJI 2-Axis and 3-Axis Brushless Gimbals. Use a sticker to stick the battery to the back of the gimbal to achieve balance.

Key Part:
Long Press: Press and hold for 3 seconds, and the band will change following the A-B-E-F cycle, and CH will always go to CH1 for the next band.
Short Press: CH cycles through 1-2-3-4-5-6-7-8.

Time Setting:
1. Create a text file named TIMESET.txt in the root folder of the Micro SD card.
2. Open the text file and type in the current date and time in the following format: yyyy-mm-dd hh:mm:ss. For example, 2014-09-30 17:30:00
3. Save the text file, then power up the camera to update the time.
4. The text file will be automatically deleted when the update is successful.

Brand Name: Eachine
Item Name: 5.8G 250mW Transmitter
Item NO.: Light L250
Frequency: 5.6-5.9GHz
Voltage Input: 3.5-5.2V
Send Power: 250mW
Work Current: 360mA/3.7V
Work Temperature: -20~+85℃
Video Bandwidth: 8M
Audio Encoder: 6.5M
Connector: USB video connector (for GoPro, supports Hero 3 and Hero 3+)
Size: 40.8 x 21 x 8mm
Net weight: 32g