The ultrasonic distance measuring meter allows you to measure， store， and calculate distances. Press "READ" to turn on the device. This distance meter allows you to store 3 different measurements. This function is useful if you want to measure the length， the width and the height of a room. The device will initially display the units in meters， but also can be displayed in feet. The distance meter turns itself off if no key is pressed within about 30 seconds. Features and specifications:- Brand new and high quality- Measure Range: 2 to 60 ft (0.50 to 18.288m)- Unit of measurement: Feet or Meters- Accuracy: 0.5%+1 digit(2~60ft)- Working Frequency: 40kHz- Working temperature: 32°F to 109.4°F (0°C ~ 43°C)- Power: 1 x 9V Battery (battery not included)- Standalone upright or Horizontal- Dimensions: 123 x 60 x 40mm (L x W x T)- Color: Mainly Black Package Included:1 x Ultrasonic distance measurer 1 x English User Manual