This Programmable Timer is an excellent choice for regulating your exterior lights, holiday lights, fountain pumps and other electronics into an automated on/off cycle. You have the option to set up to 20 programs from 1 to 7 days a week. Programs can be set as an on/off timed function, countdown function, and 3 modes of random functions to give your home that lived in appearance. What sets this apart from similar products is the built in photocell, which allows for the timer to turn on or off depending on the light recognition option you select. A manual on/off button is a convenient option if you wish to override your current timer status. The product was developed with outdoor applications in mind and built with a weather resistant casing and a slot on the back for mounting. The timer is ideal for heavy duty use with 120V loads using up to 15Amps, 1800W resistive, 600W tungsten, and motors up to 1.0 HP.