Line Laser Level Mouse GLM400CL And the last button is

And the last button is for audio on/off button

and a built-in super bright LED display which makes the receiver easy to use when doing excavation and grading jobs

Multiple Modes: Manual mode can be helpful in locking lines for use at any angle

the Johnson Horizontal/Vertical Electronic Dual Grade Laser is ideal for outdoor applications such as site preparation

This Johnson Self-Leveling Cross-Line Laser with GreenBrite Technology has a working range of up to 200 feet

Line Laser Level Mouse GLM400CL And the last button isThe Johnson Level Line Laser Mouse is a tool that shoots a straight laser line against the surface that the unit is sitting on to make the line plumb or level. It can be used for flooring and tiling projects. It has integrated horizontal and vertical leveling vials and is capable of projecting a line up to 30 feet. It features a super stick adhesive system that adheres to any surface for hands free use, reusable and leaves no marks or holes. It comes