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Prometheus Lights is a small company focused on, you guessed it, lights. They sell a handful of original design flashlights, EDC gear, and Foursevens flashlights, which was purchased by Prometheus in 2018. Prometheus lights strives to create the best products they can with quality parts and cutting edge technology. They really put it all into the Beta QRV2.
The Beta QRV2 is a small EDC keychain flashlight with a quick release mechanism on its tail. This way you will always know where it is and have with you. Simply pull the light off your keys when you need to use the light without all your keys getting in the way. This quick release mechanism has 10 pounds of holding force, so there is very little chance the light will accidentally disconnect from your keys. The beta uses a NiMH AAA rechargeable battery for improved performance. This battery lasts longer with better power delivery, and can be recharged hundreds of times. It is recommended not to use rechargeable lithium batteries or alkaline batteries with this flashlight as this can damage the internals. Although disposable lithium batteries are safe to use.
One of the unique features on the beta is that it uses a Nichia 319A emitter, which allows it to have a 90+ CRI rating. This provides a very high color accuracy and makes the light more enjoyable to use, especially on its brightest setting. Operating this light is very easy to use, simply twist the head to turn on, off, and switch between modes. The lowest setting has an output of 1 lumen (which the light can run for 50 hours on), second setting 15 lumens, and brightest 90 lumens (which it can run 50 minutes on). The light will always revert back to the lowest setting after being off for a couple of seconds. I personally think this is a great feature, I hate blinding myself when I forget I left a flashlight set to the highest setting.
The classic is available in four options: solid copper, solid, brass, electroless nickel, and AHIII black (the later two constructed of aluminum). The Beta QRV2 Classic has a hefty price tag for a keychain light at $79, but this light is well designed and built last. It even has an IPX8 water resistance rating incase you drop your keys in a puddle. The quality materials and craftsmanship that goes into this small flashlight is pretty astonishing. If you do not need quick release feature you have the ability to switch out the QR key ring for a pocket clip and tail cap. Overall this is a really great light, even for the price. It can takes up very little pocket space and can out perform other lights in its category.