Precision HR220 Laser ReceiverProduct ReviewP Click on the link for more reviewsPAllows work indoors or outdoors to 250-feetPWorks in all horizontal and vertical applications, magnetically attaches on ceilings or metal studs, and includes a heavy duty rod clampPFront LCD and simultaneous rear corner LEDs (red above, green on-grade, and blue below)PAuto shut off feature 30 minutes after last laser strike or button pressP50-hour battery lifeP