This Programmable Wall Switch Timer is designed to be a replacement for your standard indoor On/Off wall switch. It has a heavy-duty 1800W load capacity while giving you the ability to manage up to 20 different On/Off programs. Being able to schedule on and off times for lights and appliances can greatly reduce the amount of electricity consumption, by limiting the hours a switch can be used. Programs can be set to daily times, to a specific period, or to everyday of the week. Additionally, the switch has a built-in daylight savings function, random function, and a countdown timer feature. There is an LCD display that shows time in 12 hour or in 24 hours format and makes accurate programming easy to do. The large On/Off switch is actually a clever casing that hides all the programming buttons, and if you need to access them the switch simply flips up. This switch is a great choice for replacing any single pole or 3-way application where you want to add a large load, timers, or energy conservation