http://tinyurl.com/pkyahvw<P>Spectra Precision HR220 Laser ReceiverProduct Review<P> Click on the link for more reviews<P>Allows work indoors or outdoors to 250-feet<P>Works in all horizontal and vertical applications, magnetically attaches on ceilings or metal studs, and includes a heavy duty rod clamp<P>Front LCD and simultaneous rear corner LEDs (red above, green on-grade, and blue below)<P>Auto shut off feature 30 minutes after last laser strike or button press<P>50-hour battery life<P>
