Turn any lamp or appliance on and off in 30 minute intervals throughout the day. Multiple on/off times are supported. This timer plugs into any standard grounded electrical socket and has a single grounded AC socket for you to plug in your lamp or device. Setting the on/off times is as easy as pressing down the grey pegs at the desired time(s) as marked on the dial. A switch on the side of the timer selects between always-on and timer modes.