Well, I reduced the size of the unit over all. Then because the 9V lasts about 3/4 a day, I put on a remote power supply. You can see the RavPower supply as the primary power box (it also plugs into the wall and charges while it keeps running. And inside the “tube” where I tried to fit the kit is a small lithium battery to keep the unit running when the I replace the external power. The red button on the top of the tube is the on off switch for the detector. And of course, it doesn’t all fit into the plastic tube for the pen kits I had, so I’ll have to work up something else in that regard. However, I think the power supply may be sufficient to carry on for a bit. We’ll see… meanwhile the video is here.