The Intermatic T101 Series 40 Amp 120 Volt 24hr 60Hz SPST Mechanical Time Switch is a heavy-duty timer wall switch suitable for both interior and exterior walls. It features a dial control style with a single pole single throw (SPST) interruption type, making it ideal for controlling your electrical outlets with ease. This timer switch includes features such as vacation mode, indicator light, and an illuminated dial for convenient operation. With a maximum amperage of 40A and tamper-resistant resistance properties, this Intermatic switch is a reliable and durable choice for your electrical needs.