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 to allow detector to be mounted on the metal tracks and there is a heavy duty clamp for mounting on a grade rod the dector 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