This box is made to hold the GH-718 PIR sensor. http://www.emartee.com/product/41543/Should be easily adapted for Parallax PIR sensor. http://ch.mouser.com/ProductDetail/Parallax/555-28027/?qs=%252bOsorUj7CR5M4nD56biVIw%3d%3dYou can find two boxes for different setups. In the first box the sensor is strait (for the wall), and in the second box the sensor have an angle of 45° (for the roof).A drill is required. There is no installation holes on it. I made it this way to make it's easier to print with a makerbot.