The DEWALT DE0892G Green Beam Detector is very easy to use and offers a 50m working range. With selectable narrow and wide accuracy settings and a backlit LCD display. Magnets allow detector to be mounted on the metal tracks and there is a heavy-duty clamp for mounting on a grade rod. The detector will automatically shut off if it is inactive for 5 mins, prolonging battery life. Compatible with: DCE088D1G-QW/-GB/-XE & DCE089D1G-QW/-GB/-XE. Supplied with: 1 x Heavy-Duty Detector Clamp & 1 x 9 Volt Battery.