The FF40M Commercial Auto-Off Timer is designed to replace any standard wall switch, single or multi-gang. This energy-efficient mechanical timer does not require electricity to operate. In addition, it automatically limits the ON times for fans, lighting, motors, heaters, and other energy consuming loads. Hold feature enables the user to override the automatic shut-off function. Rugged time dial plate easily withstands the abuse encountered in commercial environments. Commercial “brushed metal” (plastic construction) look meets NEC requirements. Time saving up front terminal connection with teeter-type terminals. Press-on knob design ensures quick and easy installation. CFL compatible.