[Self-leveling and 2 optional modes] In automatic mode, self-leveling mode is available and the tilt range is 4°.The laser is automatically leveled.Otherwise, if the tilt angle exceeds 4°, the laser beam will flash and trigger an alarm indicating that it is no longer horizontal.The locking pendulum switches to manual mode and the automatic leveling function is deactivated and locked, allowing the device to be used from any angle. [High visibility and accuracy] Thanks to the powerful laser diode, the line laser is very eye-catching and can easily project a bright red cross at a 110° angle.Horizontal line accuracy: ±2 mm / 10 m (radius) Vertical line accuracy: ± 2 mm / 5 m (radius).Range: 15 meters. [Ideal for construction work] It can also be installed on a 1/4 tripod (not included).You can freely rotate 360° for your work. [Durable and Dropproof] IP54 dustproof and waterproof to ensure working in harsh conditions.Dropped from a height of 1 meter on six sides without losing functionality or accuracy. Note: This device is not suitable for extreme sunlight. Good quality product