2 Thank you for purchasing the modern temperature controller based on an advanced microprocessor. The Auraton TRA head with the Auraton 200 TRA controller is a programmable room thermostat. The Auraton TRA head is intended for installation on M30x1.5 radiator inserts and, using a special adapter, on Danfoss RAN valves (the adapter is supplied. The Auraton TRA head communicates directly with the Auraton 200 TRA controller, receiving information about the current temperature in the room and the preset temperature. There can be any number of radiators with Auraton TRA heads in a room but all must be paired with the same Auraton 200 TRA controller. If the number of the Auraton TRA heads is larger, the speed of response of the radiators to changes of temperature in the room increases, which is very beneficial.