specification: * Power supply: 9v Alkaline Battery(Not included) * Unit of measurement Feet or Meters * Measure Distance From 1.5 Feet to 60 Feet or0.45mto18.288m * Area, volume, addition, subtraction calculation. * Frequency: 40kHz (ultrasonic pickup) * Working temperature:32¡ãFto109.4¡ãF( 0? ~ +43?) * Range 2 to60 ft(0.50 to18.288m) Working temperature:32¡ãFto109.4¡ãF * Working temperature:32¡ãFto109.4¡ãF * Range 2 to60 ft(0.50 to18.288m) * Resolution0.01Mor 1/2 Inch * LCD with Backlight. Single Package Include : 1 x Ultrasonic Distance Measurer 1 x English Manual 1 x original Factory package