It's Combination of Date Transmission, Picture Transmission and Remote control.

Specification:
1. Data Link, measured distance 5-30 kilometers
2. Stable Link, dual redundant transmission system
3. Long Battery Life, 4000mAh built-in, 30-40h battery lifetime
4. 100mw output power
5. 12 Channels

If you're interested, please contact me to on whatsapp(+86 18682363756) get more detail(price, pictures, videos)
Awaiting for your news.

Best regards
Molly