Specification: It is a perfect tool to quickly know the distance, area and volume of a room. Your distance meter transmits ultrasonic waves to a point you want to measure. It measures the time taken by the waves to reflect and then calculates and re-transcribes the distance. Portable digital laser distance meter with high precision and wide measurement range. Mini size and handheld design, portable and convenient. Large LCD display, give you a clear view. Type: Ultrasonic Distance Meter Power Supply: 1 x 9V Alkaline Battery (Not Included) Frequency: 40kHz Resolution: 0.01m Working Temperature: 0℃ - 50℃ Features: Ultrasonic Distance Measure, Handheld, Compact Measure Distance: 50cm - 18m/1.64ft - 59.06ft (Approx.) Size: 142mm x 73mm x 41mm/5.59" x 2.87" x 1.61" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Ultrasonic Distance Meter 1 x User Manual