Back Horn/Strobe Field selectable candela options of 15, 30, 60, 75, and 110 candelaSuper-Slide™ Bracket - Ease of Supervision TestingCheckmate™ - Instant Voltage VerificationSynchronize strobe and/or horn with Gentex Series Control ModuleLower Installation and Operating CostsSwitch Selection for High or Low dBATamper-proof Re-entrant GrillSwitch for chime, Whoop, Mechanical and 2400Hz ToneSwitch for Continuous or Temporal 3 (not available on whoop tone)