Bright green-beam laser three times brighter than standard red beam, Fast horizontal and vertical self-leveling with disturbance monitor — for level and alignment, plus a 90° layout beam, Accurate up to ±1/8 In. at 100 Ft. (horizontal and vertical), Full selection of beam-visibility enhancements — variable-speed selection and variable-scan angles for maximum visibility in light conditions, Two large, easy to grip carrying handles, Up to 40-hour battery life on 2 D cell batteries