It picks up movement, and that triggers an internal switch (computer board) to turn light on. If this is attached to a regular light switch, leave the light switch in the ON position. After a few minutes (depending on what you set the time at), the light will go off. Sometimes, people aren't big fans of these switches - because if they are in a room, and there's no activity (eg. working on the computer, reading a book, etc.) - the light will automatically go off. Then, you have to wave your hand - or get up and move - in order to get it to turn back on. So, setting the sensitivity levels, and time intervals are important in relation to the use. Hope this helps! Feel free to ask more question's if you'd like - and I'll answer you as soon as I'm able too...Jim
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