3 bridging levels: the laser level with a level, a block and a 45 bladder to determine the horizontal and vertical level. For more accurate results. COMPATIBILITY - Ideal for hanging pictures along a stairwell, hanging mirrors, installing curtain rods and other household items - The laser part can be separated from the set and used alone - For use indoors only (ideal for father's gift).Easy to use: it is equipped with a selection button on the front. It controls the switching of vertical laser line, horizontal laser line and cross laser line mode and is suitable for different modes of use, more precise and more stable.COMPATIBILITY - Ideal for hanging pictures along a stairwell, hang mirrors, install curtain rods and other household items - The laser part can be separated from the set and used on its own - For indoor use only (ideal for dad's gift) .Easy to use: It is equipped with a selection button on the front. It controls the switching of vertical laser line, horizontal laser line and cross laser line mode, and is suitable for different modes of use, more accurate and more stable. Note: The data is all measured manually , please allow 1-3cm error, due to the light and display difference, there will be some color difference, the actual object received shall prevail.