The 2151 low-profile photoelectronic detector uses a state-of-the-art optical sensing chamber. This detector is designed to provide open area protection and to be used with compatible UL listed control panels only.
The SpectrAlert Advance HRK-R (replacement model) is a red, 12/24-volt horn for outdoor ceiling or wall installation. Offers mounting plate only - no back box included.
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