Self-Leveling & LED Indicator: With the switch to the "unlocked" side, the tool is in self-leveling mode, which means the tool will level itself if it is within ±4° of horizontal and the LED indicator keeps in Green. If the surface exceeds ±4° from horizontal, the laser line will gone and the LED indicator will go red. In this case, adjust the angle of the surface slightly for leveling
Wide Application: Slide the switch to "lock" side and press the button 3sec to turn on the laser in manual mode, lock lines for alignment to other angles, help you with paving tiles, installing photo or furniture carpentry, hanging wallpaper, etc
Green Beam & Highly Adaptable: The green laser is twice as bright as the red laser using the same light source. It quickly projects bright horizontal and vertical green-beam lines onto flat surfaces and levels with great precision. This is a Class II laser product with an output of less than 1mW.
Portable & Durable: Laser leveler tool with a portable size, you can easily put it in your pocket or tools bags. Covered by TPE soft rubber for a shock-resistant and comfortable grip. Comes with 2 AA batteries
NOTE: It is recommended that you avoid direct sunlight when you use the laser level; Because of the particularity of all laser products, strong sunlight weakens the laser energy and can affect accuracy and measurement range