The EUROLITE LVH-8 is a compact video presence detector and relay for audio/video systems. It detects valid NTSC and PAL video signals and generates a control signal according to their presence or absence. The unit provides a feed-through video connection, LED status indication, and relay contacts configurable as normally open or normally closed. It operates from a 12–24 V DC supply via screw terminals and supports bridging or terminated operation.