Yale HSA Alarm Control Unit Sold with power lead. Sold for spares or repairs - the alarm works but the sounds that comes out has gone quiet. On doing some research, it is possible (but I am not sure) that this could be fixed with a change of the internal battery (can be bought on Amazon). I have reset the unit. See photos for the cosmetic condition. Happy to answer questions. Also selling 3x PIR sensors and external alarm box
eBay