The features of this siren are easily selected at installation using an internal DIP switch. The SA-441M MagForce Mechanical siren is designed to power two �100-watt siren speakers �and includes external fusing, short circuit, high voltage and reverse polarity protection systems. A detachable wiring connector and optional mounting bracket for the PA microphone are also included. As with all Carson Sirens products, the SA-441M MagForce Mechanical is backed by a no-hassle 5 year limited warranty.