All of the features are easily selected at installation using an internal DIP switch. The SA-500 Cruiser Siren is designed to power one or two 100-watt siren speakers and includes internal fusing, short circuit, high voltage and reverse polarity protection systems and an output indicator for diagnostic purposes. A wiring connector with screw-down terminals and optional mounting brackets for the siren and PA microphone are included. As with all Carson Sirens products, the SA-500 Cruiser is backed by a no-hassle 5-year limited warranty. Compact 100/200-watt electronic siren amplifier Siren Wail, Yelp, Phaser, Manual and Air Horn tones with optional European HiLo/Two Tone Four position rotary switch with two push-button overrides PA override with attached noise-canceling microphone and separate radio and PA volume control knobs LED backlighting Horn Ring Cycler 2 (HRC2) for hands free siren tone control Siren Cutout / Park Kill to disable siren when exiting the vehicle DIP switch programmable Internally fused Short circuit, high voltage and reverse polarity protection systems Output diagnostic LED Wiring connector with screw-down terminals Mounting brackets with the siren and PA microphone 28 volt option also available 2-1/8? H x 6-1/8? W x 5-7/8? D No-hassle 5-year limited warranty