the solar tat is upto 1km in range, (radio, not the the beam pair)
the visonic tat is a pir for back garden, the sort of size with neighbours with cats, balls ect....
I suspect either rigged up make a alarm will just piss you off until you disconnect it....
Chinky tat,
but work quite well, brackets ain't great, programming is worse, unlikely to work all the time off solar in the UK as not enough charge to go over night
its a chime for the drive rather than security...
I'm changing my answer... Visonic DT still late 80's
The pic need rotating to the right, the jumper between pyro & leds is marked "m/w"
Dt bit is the flat pcb type
looks right old.,...
pulse count, no. of pulse of movement before the alarm relay opens
memory - I assume a latch indication if multi sensors where on one circuit