The SSPK24WLP can be mounted in a 4" square x 2-1/8" deep back box, an extension ring is not needed.
The SSPK24WLP Series provides a 25 or 70.7 VRMs speaker with field selectable power taps of 1/8W, 1/4W, 1/2W, 1W, 2W or 4W. The SSPK24WLP strobes can be synchronized by using the Gentex AVSM Control Module, FACPs or power supplies that include the Gentex Synchronization Protocol.
The SSPK24WLP Series grills are constructed of high-impact textured plastic and are warranted for 3 years from the date of purchase. The SSPK24WLP devices are listed to ANSI/UL 1480, the selectable candela strobe unit is listed to ANSI/UL 1971 and the 15/75 unit is additionally listed to ANSI/UL 1638.