Bosch 360-Degree Self-Leveling Exterior Laser Kit GLL 150 ECK VERSATILE: The Bosch GLL 150 ECK offers 360-degree full coverage horizontal leveling for all leveling applications. COMPACT: The laser kit is compact, lightweight and portable with single switch operation making it easy to use and operate EXTENDABLE: With the included Bosch LR3 Line Laser Receiver users can extend the range when extra distance is required, for maximum one person operation convenience SELF LEVELING: With Boschs Smart Pendulum System the alignment laser self levels and indicates out-of-level condition. Secure transport lock protects pendulum when unit is switched off Class IIa laser product, &lt;1mW power output Class IIa laser product, &lt;1mW power output