Product Description: The Opti Logic 400 XL Laser Range Finder is an easy-to-use, electronic instrument designed for hunting, utilities, construction, and many other distance measurement applications. The Opti-Logic 400XL Laser Rangefinder allows rapid, accurate determination of distance to an object in a matter of seconds using one button operation and "Red-Dot" technology for easy sighting. Opti-Logic Laser Range-Finder 400-XL is designed for years of trouble-free operation and is proudly Made in the USA. Specifications for Opti-Logic Range-Finder 400XL: Operational Range of 400XL: 4-400 yd(Passive) Up to 999 yd(Reflective) Approx. Size: 1.7" x 4" x 5.1" Weight: 11 oz Range Accuracy: +/- 1 yard (+/- 2 yards for very dark or very bright targets). Range Resolution: 1 foot / 0.5 yard / 0.1 meter Readout: Easy to read external LCD display. Units of Measure: User Selectable in either feet, meters, or yards. Viewfinder: Monocular viewing port. Red LED aiming sight, +/- 0.1 degrees Battery: Single 9 volt battery. Operates for approximately 1000 readings. Operational Temp: 0 - 40 degrees C, 32-104 degrees F. Relative Humidity 5-95% non-condensing. Laser Type: Infrared Class 1, eye safe 905nm Laser. Features of Opti-Logic 400XL Laser Rangefinder:Viewfinder: Look through the viewfinder window and aim the Red Dot at an object.Range Button: Press the "Range" button to take distance or height measurements, or to select modes.Display: The Opti-Logic Laser Rangefinder is userprogrammable to read in either Feet, Meters, or Yards.Low Battery: Replace the battery when the Low Battery symbol is displayed constantly.Automatic Rain Mode: For range accuracy in light rain conditions.Automatic Timeout: To save batteries, the instrument will automatically "time out" after about 7 seconds.