A big problem with traditional keychain flashlights is that you can't remove the flashlight from the key chain without a lot of hassle, but the Prometheus Beta QRV2 flashlight changes the game. It features a quick-release snap-on/off design that is secure -- it requires 10 lbs. of force to detach -- and easy to remove in a hurry. It effectively negates the inherent downside of the traditional keychain flashlight.
The Beta QRV2 utilizes a Nichia 219 LED for high color rendering (CRI) and runs on a single AAA battery. Two modes are accessed using the twist switch. This model has an electroless nickel body.