The Stanley STHT77148 manual wall laser is the perfect wall level for all of your household jobs; hanging pictures, mirrors, shelves, and more. It features raised bubble vials which allows to to visually identify accurate horizontal and vertical leveling. This laser offers a 360-degree rotating wall attachment, and can measure up to 10-feet away. Backed by Stanley 2 year limited warranty. Includes: 1) wall laser, 2) AA batteries. This is a Class 2 laser product, Power output = 1.5mW