laser pointerft/m display optionsMeasuring range: 0.5m to 18mWith LED backlit LCD screenNo key is pressed after 15 seconds of automatic shutdownMemory can store 3 measurements for area and volume calculationsSupports summarization, multiplication and subtraction of 2 measurement data.All stored measurement data can be cleared.Corrected error: measurement range of actual distance displayed when "wrong"Power: 1 x 9V alkaline type 6LR61 battery (not included)Accuracy: +/- 0.5%Ultrasonic frequency: 40 kHzWorking temperature: 0~ 43Dimensions (h-p-l): 142 x 73 x 47mmWeight (without battery): 144.6gLaser beam power in megawatts (MW = milliwatts)Wavelength: 650nm (NM = Nanometers)Package Included:1 Ultrasonic Rangefinder1 x Instruction Manual