ITEM NAME:Ultrasonic Digital Infrared Range Distance Meter Range Finder Diastimeter B Y3O2 Ultrasonic Digital Infrared Range Distance Meter Range Finder Diastimeter B Y3O2 Product size: 125*60*40mm/4.92*2.36*1.57 inch Measurement range: 0.5-18m/1.64-59ft Accuracy: 0.05 (mm) Working voltage: 9 (V) Weight: 102 (g) Colors: White, Black material: plastic Unit of measurement data: feet or meters Precision:0.5%+1 bit (2-60 feet) Working frequency: 40kHz Working temperature 32-109.4℉(0~43℃) Measurement range from 2~ 60 ft(0.55-18 meters) Matters needing attention: The measurement results will last for about 30 seconds (or longer if you press the other key in 30 seconds). If you try to measure a distance of less than 2 feet (0.55 meters) or 60 feet (18 meters), a "ERROR" error will appear on the screen. Notice: The rangefinder launches a visible laser with a wavelength of 650nm. Do not look directly at the laser-beam, nor point the laser beam at other people's eyes. Two stage laser-product output