The new Pro version powers a 3mm 565nm Green LED specifically selected to match a laser cut Lexan filter material. Batteries load like a PEZ dispenser (similar to the FLITELite Microlight). The light uses 3 Silver Oxide 389/390 batteries. The battery door is a silicone molded part that has excellent elemental and drop resistance. It attaches to your flight glove with Velcro One-Wrap, and has an integrated, battery saving 10-minute auto-off. Simply touch the button and light will shine wherever the pilot points. Press and hold the button and light will cycle from low to high bright - release when the brightness is set where you prefer and that setting goes into memory. If the battery power is low - the light will blink when powered up to advise it is time to change the batteries. Perfect for complicated lower panels, radio tuning, and searching for circuit breakers.