Thank you for viewing. I purchased this from a flea market site two years ago. From the beginning, as shown in image 3, the wire supporting the negative terminal of the batteries is a little unstable, so it's best to hold it in place by hand when inserting batteries. The penlight lights up. I never actually used it at a live performance, but it responds normally to the concert mode and self-mode of the light stick app. Another point of concern is that the silicone on the handle has a slight odor. Perhaps because it was stored without being used, I notice it a little, but it's not noticeable unless you try to smell it. There is no discoloration or wobbling, and the condition is very clean. Considering the above points, I welcome purchases from those who don't mind the details and those who want to support with two penlights.