Dewalt DW087K Self Levelling Line Laser Kit complete with 3 x AA batteries, wall mount bracket and heavy duty carrying case. Features: Self-levelling cross line laser is accurate to ±0.3 mm/m in levelling applications Built-in magnetic pivot bracket mounts easily on metal surfaces Overmolded housing helps maintain calibration under jobsite conditions Includes 3 (AA) batteries for 20+ hours runtime 2-button operation & low battery indication for ease of use Self-Levelling up to 4° surface angle with automatic out of level indication, marks a levelled line in seconds Kit box protects unit and helps maintain calibration when stored in gang box