I use the Vipertek VTS-881 models and have for quite a while. They have really good output (and even throw) with the flashlight and they are very compact. The previous model, the VTS-880 had a much lower output even though it’s twice the size. The VTS-881 is a much better unit. I’ve been giving them out as gifts the last year and a half or so. But like all models in this space, they are fairly cheaply made in China, so you’re playing the lottery with every budget stun gun I’ve ever seen. The Viperteks can be quirky about charging, and a couple times I’ve pulled them out of the wall almost too hot to touch, where most of the time they charge fine.