Brand new - has expiry date of 2018 inside. The Danfoss TP5000Si-RF + RX1 is a wireless programmable thermostat system that offers 5-2 day programming capabilities. This advanced thermostat from Danfoss is designed for precision control of heating and cooling systems in residential settings. With its programmable features and use of AA batteries, this thermostat provides convenience and energy savings while ensuring optimal indoor temperatures. Ideal for those looking to maintain a comfortable living environment with ease and efficiency.