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The Pegler Open Window Sensor is a simple money saving accessory for your Terrier i-temp Programmable Radiator Control Valve, which helps the Terrier i-temp conserve energy by sending a radio signal when the window has been opened. The Programmable Radiator Control then reduces the temperature and signals the i-temp to return to normal operation when the window is closed again. Can integrate with multiple Terrier i-Temp and window open sensors to produce maximum energy savings. 5 year battery. 12 month Manufacturers Warranty.