Saves energy by remembering to switch off appliance when you might forget. Each press of the button cycles the timer through the available periods, as shown by indicator LEDs. The connected load is automatically switched off at the end of the pre-set time, or it can be switched off manually using the push button. Large energy savings are possible by adding this simple device to any electrical appliance, up to 3 kW (resistive). These units are perfect as boiler override or extension timers and can be used on panel heaters, immersion heaters, heated towel rails, and oil-filled radiators.