Aube 240 volt relay for heating/cooling. Has its own built in transformer and fits nicely inside any stock baseboard. Nine available. These are 4 years old; bought new from Westburne at a price of $124 each only four yeras ago when I did a big house renovation. Just installed heat pumps so no need of electric baseboards anymore. Also selling Stelpro and Ouellet baseboards and Honeywell thermostats (programmable and non-programmable). See my other listings. Cheapest I can find online is Amazon at $72.80 (free shipping). I'm asking $45 for exactly the same thing. These can be considered almost new as they have cycled very little given that we don't keep the house hot in the winter. If you have low voltage heaters now, if your current relay goes, you'll have to scramble to get a replacement... if they are available. These took weeks to get in as they come from China. Phone around and see local pricing. Situated in Cordova Bay... non-smoking household.