Each flashlight is CNC machined from anodized aluminum or brass. A Nichia 219 LED shines through the glass window and is controlled by a microprocessor. You can switch between brightness modes by turning off the light and turning it back on. The body is attached to the key loop by a brass quick release, allowing you to easily detach it when the need arises. the light also takes a standard AAA battery for convenience. On the Color Rendering Index, a measurement of how accurately a light source renders the full color spectrum, daylight scores a perfect 100. While not quite the sun, the Beta-QR is no slouch at a 93, giving you a handheld device with a beam as bright as you need, when you need it.