Optional back boxes (DP38BXMF and DP38BXMS) are available as both flush and surface mounts.M-Series Door Station Kit- Fon DP38BKMManufactured in aluminum with anodized Brass, Black, Bronze, and Aluminum finishesMounts into any standard Music and Sound???s box as a flush mountOptional surface mount back boxes (DP38BXMF and DP38BXMS) mount easily on almost any surfaces including fences and gatesAll