Integration of distance meter and detector With laser point aiming to see the target 2 LCD designed for easier reading　 Auto calibration and auto power off Auto area, volume calculation Specification: Measurement range: 2′ to 50′(0.6-15 meters) Accuracy: ±0.5%±1 digital Resolutions: 1′(0.01m) Aperture angle: approx ±5 degrees Laser diode type: red laser diode 650 nm Power supply: 9V block battery (not included) Dimensions: 217 mm*66 mm*42 mm Weight: 193g Calculation range: Length: -9999′11〞(9999m) Area: -9999′sqft(9999m2) Volume: -9999′cuft (9999m3) Operation environment: indoor Operating temperature: 32o F to 104o F (0o C to 40o C)