Description : CP-3010 Laser Rangefinders Ultrasonic Distance Measurer Meter 100% Brand new and high quality LCD with Backlight Your distance measurer transmits ultrasonic waves to a point you want to measure Auto OFF : switches off if you do not press any key for about 1 min It measures the time taken by the waves to reflect and then calculates and re-transcribes the distance Level function (one vertical level bubble， one horizontal level bubble) Specifications : Measure distance : 0.5m ~ 18m Frequency : 40 kHz Accuracy : +-0.5% +-1cm Resolution : 1cm or 21 inch Units of Measure : Feet\/Meters Laser beam : Wattage 1mW (mW =milliwatt) Wavelength : 650nm (nm =nanometer) Power supply : 1 x 12V 23A Battery (Not included) Package included : 1 x CP-3010 Laser Distance Meter (Battery is not included) 1 x English User Manual Details pictures :