Wide Application: This laser level only support indoor use in daylight that strong sunlight may effect its visibility. suitable for homeowners and small decoration work. This is an entry-level, one-button operation make it really easy to use. Suitable for bathroom renovation, home decoration, hanging photos, laying tiles and so on. It is a practical tool for small decoration projects.Specification: Model: CM-301 Self-leveling Mode and Manual Mode 4 Grade Cross Laser: 50% / 65% / 80% and 100% brightness to last longer Working Time: up to 62 Hours Laser Class: Class ? Laser Wavelength: 630~670nm Leveling Accuracy: ± 3mm/10m Degree of Protection: IP54Package Includes: 1 x Cross Line Laser Level 1 x Carrying Bag 2 x AA Batteries 1 x Magnetic Mounting Bracket 1 x User's ManualSafety WarningDo not stare into the beam