Friendly Note: Compatible Laser LevelsThe receiver can only be used with Laser Levels have Pule Mode Function!!! Compatible with Line Laser CM03 and CM04. Can NOT Be Used WithPlease NOTE the receiver is NOT Compatible with Rotary Laser Level!!!!!!!This product needs to be used outside 3m / 118in, and will be interfered with when used inside 3m /118in Precise Positioning: The laser receiver offers exceptional accuracy, receiving signals up to 197 ft for precise location tracking at great distances. Compatible with pulse mode laser levels (red and green), it features dual LCD displays for easy readability from both sides. You can adjust the height until the lines and arrows on the LCD disappear for a horizontal reference