No Battery!No Battery!The product has passed EN60825-1 and CE Certification.It is the perfect tool for anyone who needs to find out the Area and Volume of a room quickly and Accurately.It can accurately measure distances in a straight line by transmitting Ultrasonic Waves to the point youto measure.It can measure & calculate the Area or Volume of a room in Feet or Meters.It can be used Indoors & Outdoors， Current Temperature Display.Laser Pinter Function to determine target to be measured. Specifications: * Battery powered: 1 x9V E type 6LR61 (not included)* Unit of measurement: Feet or Meters* Accuracy: ±0.5% ±1 digit (2~60ft)* Resolution: 0.01M or 1/2 Inch* Back lit LCD Display* Working Frequency: 40KHz* Working Temperature: 32°F to 109.4°F (0°C to 43°C)* Distance from 2 to 60ft (Approx 0.50 to 18.288m)* Weight: 150g Notes: * The laser emitted from the units is visible laser of 650nm wavelength.* Don't stare into the laser beam and also don't shoot laser beam to any other's eyes.* Class II laser product Output < 1mw Package Included:1x Ultrasonic Tape Measure Distance Meter (not included battery)1x Manual (eight-page)