The Schlite lights your sight pins with a bright blue LED so they stay sharp in low light. The LED is mounted in an 8-32 bushing that threads straight into most sights. A 12-position switch gives you 10 brightness settings, with off at both ends. It runs on a single CR2032 battery, and the removable LED lead and weather-resistant build hold up in the field. Adapter bushings for 1/4-28, 3/8-32 and 3/8-24 sights are sold separately.