STI's Round and Rectangular Sirens and Strobes
STI’s round and rectangular sirens and strobes can be used with a cabinet, or mounted to doors, walls and ceilings. The round model (STI-SA5500) has a choice of eight strobe flash patterns with speed selection, and it includes a backup battery feature. The rectangle model (STI-SA5600) has a tamperproof lens option. Both models have a 12–24V DC power supply.