To get a cheap telemetry system I mounted the internal pcb boards and cameras from an ar drone 2.0 drone. The fpv is less laggy than the fc40 camera and it automatically overlays the battery voltage and percent, altitude, distance, it shows a gps map view of you and your drone....and more. The whole mod only cost about $80 cause I bought a used broken ar drone off ebay. I upgraded the internal wifi antenna for it also to a external dipole antenna and using a range extender and a wifi amplifier 2500mw I get good fpv up to 1500 meters or so