fpv video
This is a system for transmitting and receiving video remotely over the air.
It is either WiFi or 5.8GHz radio based, older systems include 900Mhz (popular in USA), 1.3Ghz, or 2.4Ghz.
This format includes sound and range up to around 1-5 Km (15 miles with high power equipment could be achieved) but most are shorter ranged with transmission powers between 25 and 250mW (some toys even lower)
500mw output should be able to transmit video for 1km~1.6km
FVP Cameras
Cameras themselves are just video and can come without any transmission electronics, their resolutions vary dramatically from very low res to 4k 60Hz High Definition(HD). HD video cameras start with an image sensor of around 2Megapixels (for 1080p resolution), most high resolution(hi res) cameras are for taking still pictures or recording video directly to a flash drive.
PAL/NTSC low light 0.01Lux camera, Effective Resolution 768(H)Ă—576(V)
VIDEOTORG Mini FPV with 2.8mm Lens
FPV Wifi Camera
FPV Wifi Camera of the syma x5sw