Talonbd yes - 2s is 7.4v this camera takes 5 to 20v so Rande of battery is 2s to 4s.

Talonbd No that quad uses wifi tyo send video so you'd need different camera and vtx.

Talonbd No the Eachine 520S uses a WiFi camera which sends video to your cell phone or tablet running a app. The moneagle receives analog video on one of 40 channels allocated to quad copters in RC hobby band. You'd have to convert video from phone to analog signal to use moneagle screen and that would be too much of a delay to use to fly quad. You could put a all in one Camera-vtx on the quad and use moneagle instead of app to fly but WiFi quads kinda designed to use your phones screen to show you video and telemetry. Hope this helped.