Timeguard TRT039N 7 Day Digital Heating Programmer - 4 Channel 7 day digital heating programmer with 4 independent timed channels e.g. hot water and 3 separate heating zones, complete with an easy view blue luminescent screen. 4 independently timed channels - hot water and 3 separate heating zones. Suitable for fully pumped systems. Simple push button control (illuminates on setting). 3 timed control periods (5 day plus 2 or 7 day). 1 and 2 hour boost function. Holiday mode. Always ON/OFF override mode. Blue LED screen illuminates upon setting. Optional automatic summer/winter changeover. Voltage free change over contacts. 24 hour factory fitted rechargeable battery backup. Switch Rating: 3(1)A. Technical Specification Operating Voltage: 230V AC-50Hz Timer Mode: 12 / 24 Hour + Boost Boost Duration: 1 or 2 Hours Number of Channels: 4 Current Rating: 3 (1) A Voltage: 230V, 50Hz Operating Temperature Range: 0°C to 40°C Micro Disconne