Mounts to a standard 4 inch junction box with round plaster ring
(provided by electrician). Electronic transformer (included) fits in
junction box. One FreeJack port; for ceiling or wall. This product can mount to either a 4 inch square electrical box with round plaster ring or an octagonal electrical box (not included). Transformer (included) fits in junction box. For ceiling or wall. If wall mounting, head should be no longer than 6 inches.