For situations that require a tactical light as well as a laser sight, Streamlight has designed the TLR-4 Compact Rail Mounted Tactical sight, which allows for convenient switching between a high-intensity 170-lumen beam and a 640-660 nanometer red laser. C4 LED technology employs a textured parabolic reflector to concentrate the beam and provide total peripheral illumination with regulated light intensity to maximize battery life. The sight can be adjusted for both windage and elevation and features a master power switch that can be operated with one hand. The durable polymer casing can withstand extreme temperatures and is both impact and water-resistant. This sight is designed to fit compact and subcompact handguns, but can also fit most full-size pistols with rails.