I finally put this on the Q today. Such a simple accessory, but way more useful than I thought. Before installing, I put the batteries in and tested it. It worked, but it sounded like there was something rattling around inside. And it was going on and off, making me think there was a loose wire or something inside. As the saying goes: 'you have to be smarter than the tools you're working with'. I was not. This little gadget actually has a ball bearing or something inside that breaks the circuit when the lid is in the down position, saving your batteries and giving you an 'auto on' functionality as you lift the lid. Of course, there is a button for manual control as well. Tonight was only my first use, but I'm really liking it. it lights up the grill surface sufficiently and doesn't get in the way. And the auto-on functionality is really cool.