The HS24-177 Series is a low profile strobe, or horn/strobe combination that offers dependable audible and visual alaRMS with the absolute lowest current available. The HS24-177 Series has a minimum flash rate of 1Hz regardless of input voltage. The HS24-177 Series is shipped with the standard 4" mounting plate which incorporates the popular Super-Slide® feature that allows the installer to easily test for supervision. The product also features a locking mechanism which secures the product to the bracket without any screws showing. The HS24-177 Series also features the patented Checkmate® -Instant Voltage Verification feature which allows the installer to measure the voltage drop and match it to the blueprint. The HS-177 Series appliances are ANSI/UL 464, ANSI/UL 1971 and/or ANSI/UL 1638 listed for use with fire protective systems and are warranted for five years from date of purchase.