**This model is no longer stocked by Electrical World. Please see our wide range of Time Clocks - Available Here** The Greenbrook T634A-C, Central Heating Channel Timer with Boost and Advance offer the equivalent of four separate seven day timers in one slim elegant enclosure. Each of the four channels offer up to 3 programmed operating periods per day for each of the seven days of the week, with a boost and advance timer on each Suitable for controlling home appliances such as heating and lighting systems. Due to its compact size, the channel timer range is suitable for mounting in a flush, single gang wiring box. Up to 4 independently programmable channels 3 on and 3 off settings available per day One hour boost facility Programme advance function Summertime setting 7 day battery back up Clear backlit LED display Double insulated Compact size 230V AC, 3A resistive, 1.25A inductive (per channel) Dimensions 95mm(Height) x 154mm(Width) x 37mm(Depth) Conforms