In this video I’m checking out a weird little keychain light that actually turned out to be way more useful than I expected: the Tunenge S15 Pro-TK. On paper it’s an ultralight, 750-lumen max, multi-function LED keychain flashlight made from 7075 aerospace aluminum. In hand, it’s got that smooth, streamlined look—honestly it reminds me of a 1950’s futuristic airplane design—and the build quality on the aluminum case is just plain nice. What makes this one stand out is the rotating end cap. It spins freely 365 degrees, but it can also disconnect from the body so you can pop it off your keychain and access the flat-head screwdriver that’s built in. You also get a front light, a side light, and USB-C charging, which is exactly what I want on a modern EDC light. The big takeaway: the screwdriver sounds gimmicky, but in real use it’s one of those odd features that ends up being handier than you’d think—especially when you’re dealing with quick fixes in the field or around camp.