The SpectrAlert Advance series offers the most versatile and easy-to-use line of low frequency sounder and low frequency sounder strobes in the industry.
The SD-651 is designed to meet the performance criteria designated by UL. Its sensing chambers are sealed against back pressure air flow, dirt, and insects.
Photoelectronic Low-Profile Plug-In Detector for Special Applications
Note: For pendent mount applications where remote testing is NOT needed, the 2151 needs to be used with either the B114LP or B114