Descriptioncolors:As show in the picture*Power supply: one 9V battery (6F22) (not included )*Unit of measurement: feet， meters*Measurement accuracy: 0.5 percent*Measuring range: 0.5-18M*And the maximum distance: 180.00 m*The maximum calculated area: 18 * 18 m2*The maximum calculated volume: 18，000 square meters