The Stabila LAR250 (05610) fully automatic interior/exterior laser level system features a dust and water proof-IP65 exterior, and patented "SPS" shock protection system capable of taking a 6' drop to concrete. With a range of 1,150ft/350m, the Stabila LAR250 includes variable speed rotation, an operation time of 120 hours on 2 D-Cell batteries, high alert shut off function, rubber exterior over metal housing, shock absorbing interior, horizontal - vertical - 0-5° slope, 3 scan lengths, and a 90° layout beam. Start/stop rotation speed - scan length - scan line position - and slope function can be controlled at the key pad or with the included remote control. Included De-Tech receiver shows exact distance to grade in 1/16's or mm's. Adjustable wall mount bracket adds versatility in interior applications not suitable for tripod use. Stabila offers a two-year limited warranty on this item.