Your cable/satellite box, Blu-ray player, TV sound system and streaming devices all draw power 24/7, even when the TV is off. It's the same with your computer and its attached printer, scanner and accessory speakers. The TrickleStar Motion Sensor PowerStrip shuts off those power-sucking devices when they're not being used. It takes its cues from whatever device (TV or computer) is plugged into the 'control' receptacle, along with input from the attached motion sensor. Here's how it works. When you turn on the TV or computer, the power strip immediately powers up three switched receptacles for your accessories/peripherals. When you turn the TV or computer off, it shuts off the switched receptacles. And, if the TV or computer is on, but you leave the room for 30 minutes or longer, the motion sensor shuts off the switched receptacles. Come back and it powers them back up. The unit has one control receptacle, three switched receptacles and three always-on receptacles, along with built-in surge protection (1080 joules) for all outlets.