Features: High accuracy and wide measuring range up to 40m. Quick measurement of distance， area and volume with one button operation. Automatic calculation of area and volume. Indirect measurement by Pythagorean theorem. Min / Max distance tracking (display value). Battery Configuration: 1.5V AAA alkaline battery (the project does not include batteries)Precautions:this project Operating Instructions as well as Retail box outside write have 2pcs AAA battery，But our sales，It does not include the 2pcs AAA battery，Because the logistics do not support battery transport channels.please Everybody Dear buyer Look clear Description of the project，Thank you very much for your support.Package List: 1 * Laser Distance Measure 1 * Operation Instruction (English) 1 * Pouch Bag 1 * Holding Rope