Perfect function, your best choise for home, shop, company safety.

1.    2--10 light beams optional, the angle of transmitter and receiver optional.

2.    2 meters hight.

3.    And all weather is available (Snow, frog, smoke).

4.    Easy to install, convinent to use and accurate in test.

5.    Medal cover.

6.    30-60 meters detect distance.