The Leica Rod Eye 120 Basic has 2 clear displays on the front and back of the receiver With 3 audio settings offlowhigh up to 105 decibels for noisy jobs The versatile rod bracket ensures solid mounting to the grade rod supplied The circular level vial aids to keep the grade rod plumb With a protective overmould that protects the receiver from drops in tough jobsite conditions Specification Working Diameter Laser Dependent 900m Detection Window 70mm Detectable Spectrum 600-800nm Detectable Accuracies Fine ±10mm Medium ±20mm Coarse ±30mm Audio Volumes HighLowOff Automatic Shut Off 10 Minutes Arrow Display 9 Channels Protection Class IP67 Battery Life +50 Hours Input Power 2 x AA Batteries NOT supplied Dimensions 173 x 76 x 29mm Operating Temperature -20°C to +50°C