There’s not much here that isn’t immediately apparant. It’s a single AAA aluminum flashlight which is made by Dorcy and burns a single LED “bulb”. It has a “twist-on” switch and a fixed spot beam. I’ve used mine on a limited basis since last fall, and it’s still on its first battery and is still very bright. I bought it at a major big box retail store (Target or Wal-mart) for around $6.00. At one ounce with battery you can’t go wrong. I have an original Photon which I haven’t bothered to replace the batteries in because of the cost.