Full details here http://www.salus-tech.com/products/thermostat/it500/

Currently reviewing this for salus as a caravan and camping club member.

Was a bit fiddle to fit as the instructions aren't the best.

I would imagine after fitting a few this would get simpler.

Having had it in 24 hours I must say I'm rather impressed although I have nothing to compare it I would recommend to any of our customers.