The stanley slp5 fat max spot line laser projects 5 beams 3 horizontal 1 vertical 1 plumb and 1 horizontal line 120 the out of level indicator will make the laser lines flash onoff as a warning it has a magnetically dampened pendulum for auto self levelling and magnetic pivoting base with provision for wall fixing specification level accuracy 03mm at 15m self levelling range4working range 30m for dots 10m for line power 3 x aa batteries supplied laser class 2thread 14in