This Intermatic T101D89 24 Hour Mechanical Timer Wall Switch is a heavy-duty, tamper-resistant switch suitable for wall, interior, and exterior use. It features a rotary dial, switch, and digital controls, as well as a timer and auto-off function. The switch is compatible with 120 V AC current and has a maximum amperage of 40 A. The switch is made of metal and has a gray finish. It comes with a cover and is designed with a single pole single throw (SPST) contact configuration. The switch is light switch type and has a voltage of 120 V. It also has features like vacation mode, indicator light, illuminated, and dusk-to-dawn cycle. This timer wall switch is perfect for those who want a reliable and durable switch for their home or business.