Product details:

It replaces any single or multi-gang standard wall switch. This model is designed to operate without electricity. There are models with limits of 5, 30 and 60 minutes and 2, 4, 6 and 12 hours are available. Additionally, the timer automatically limits the ON times for lighting, heaters, fans, motors, and other energy consuming loads.In order to provide easy selection of the time setting, this model includes a plate with a spiral time scale and a knob. The switch configuration is DPST. Thanks to an easy "press-on" knob design and time saving "up front" terminal connection, the installation process is quick and easy. This timer is particular does not have a Hold feature.