DINGCHAO Red Beam Laser Level Receiver Detector 4.5~10 KHz Frequency with Aluminum Bracket Quickly and accurately locates any laser signal emitted from rotary or "pulsed beam" line-generating Dual sided on grade LED indicator lights with high low on grade and audible signals Can detect the laser signal up to 50 meters (164 feet) and can be put on anywhere with the clamp height detection precision with 1mm @ 10m Suitable for Red Beam Laser Level ,Cross Line Laser , but does not suitable for rotary laser level