Timeguard Wireless Digital Room Thermostat with Night Set Back TRT047 Wire-free room thermostat digital control without wires. Transmits up to 60 metres away, depending on installation. Digital room thermostat with easy visible blue luminescent screen displaying current room temperature. Simple +/- push-button temperature adjustment illuminates display on setting providing automatic temperature control for all central heating applications. Night set back, PID, and frost protection modes help improve system efficiency and reduce running costs. The TRT047 display is powered using 2x 1.5V AA batteries supplied. Wire-free temperature control. Comes complete with surface mount receiver. Up to 60m transmission range, dependant on installation. Stylish design with digital accuracy. Easy +/- illuminated push button setting. Easy view temperature display, illuminated on setting. Burner symbol display shows on call for heat. Frost protection. Temperature swing adjustm