Ideal for a number of applications, including erecting fences, building decks, positioning drainage, plumbing or remodelling interiors. Allows one person to accurately level around corners and out of sight of the electronic control unit. A consistent high degree of accuracy regardless of distance from electronic unit. Sound from the loud (95db), continuous signal indicates level, even at long distances. A loud pulsed tone sounds when above level. Unit blinks and beeps to remind users that the unit is on to prevent forgetting to turn it off - a true battery saver. 7.6m hose included. Position accuracy within 2mm. Uses 1x9V battery (not included), which provides up to 60 hours of continuous use.