Flat rectangular box 5.36 in. Lg; 2.70 in. W; 0.50 in. H with multiple pin jack projecting 0.75 in. From bottom at one of the long sides; three standard jacks projecting horizontally from the same side and one more jack projecting from short side at other end; contains circuit board and ferrite isolator for optional isolator load brought in through connector on other long side; stripline construction