The Milwaukee 165 Ft. Laser Line Detector extends laser functionality up to 165 feet indoors and outdoors for the fastest point-to-point alignment. The LEDs on front and back provide high visibility feedback, improving the set-up process. Rare earth magnets located on two sides of the detector allow it to easily attach to metal surfaces, ideal for ceiling grid installation. The included material clamp is perfect for setting elevation. The Laser Detector also features adjustable audio and over 40 hours of runtime. The 165 Ft. Laser Line Detector is compatible with all Milwaukee Line & Plane Lasers and is backed by a three-year Limited Warranty. Includes (2) AA batteries.