and high quality Hang shelves and cabinets, tiles and picture frames with accuracy. Projects horizontal and vertical laser light beam Locking 8-foot measuring tape. Standard and metric rulers. Perfect for any jobs that requires a straight line or accurate measurement. Use this multipurpose laser level for hanging pictures, installing shelving, laying flooring, hanging wallpaper and more. Laser light has an on or off power switch. Laser max output: less than 0.5mW Powered by 3xAG13 button cell battery During use, vertical lines appear horizontally and horizontal lines appear vertically. This is normal and is not a quality problem! Colour:black Material:plastic Package Contents: 1 x Laser Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.