the adt/tyco system is different. They lock it to their version, as they should cos all are sold at a loss. Unfortunately this ends up on ebay (non paying customers or van stock or... etc)
If you have an adt panel you need at least adt peripherals. If you have a non adt panel the nicked stuff wont work with it
it was the short or open on attack I didn't like. It was in the days of fob and (ademco iirc) had no answer. then they did the gal18 kit with keyprox. I never did the ksw prox but I understand why it was done
what is, the oap should as a tech bit of kit no longer be tech.
Old kit is that old, how would the convo be with 'ive got a 20 yr old pc and the parallel connected daisywheel printer has an issue with the e letter'