I recently purchased a property that I intend to renovate. It has this strange looking box on the wall with some circuitry inside it and I have no idea what it is. The house was originally built in 1990 so I think it's likely that this thing dates from then. The house has an alarm system and a Honeywell underfloor heating system but as far as I can tell, this is not part of either of those systems. Please help me solve this mystery. Thanks.