Set of two Best-in-class audio with sound by Harman Kardon Designed for use with the Anthem+ digital shower system Low-profile design Complements a variety of bathroom styles 7" (178 mm) speaker grill with 4-1/3" (109 mm) speaker Mounts within standard 2" x 4" (38 x 102 mm) walls Mounts to the wall or ceiling Speaker installs after finished wall is complete