Connect this to the REMOTE socket on the M2U or M3U CableEye (Item 811U or 821U). It functions exactly like the TEST pushbutton and frees your hands during batch testing. It is made of rugged, heavy-gauge steel for long life in an industrial environment. Secure it to a fixed base or floorboard using mounting holes in the base, if desired. This low-profile design rises only 3/4" from the floor, and its 2.5 X 3.5" dimensions require little room on your work-area floor. Includes a 10-foot cord with a miniDIN8 connector. Will not work with the M2U-Basic tester (Item 810U).