TimeGuard FBT4 Timer Switch, 230 V, Multi4 Hour Electronic Boost Timer and Fused Spur Ideal for immersion heaters, room heaters, towel rails and lighting Automatic timer countdown selection for up to 4 hours Counter timer from 15, 30, 60 120 and 240 minutes Replaces existing 13A connection unit or fixed appliance outlets Easy push button selection with clear LED output status Fits a standard flush or surface mount BS wall box min 25mm deep