The HFSF1 Small-Profile Ceiling Speaker is intended for use in 70V commercial audio and paging systems. This sturdy speaker is easy to install and only requires a 6-1/4" diameter opening in walls, ceilings or ceiling tiles. Its 7.25" enclosure keeps it compact and unobtrusive. Selectable power taps are mounted in the front. The HFSF1 is an ideal solution for commercial offices, retail and anywhere a small 70V speaker is required.