Digital Alert System (DAS, formerly known as Monroe Electronics) is a company providing digital emergency alert systems and cable television (CATV) switching and control products. It offers audio management systems and emergency messaging devices for broadcast TV, cable television (CATV), Internet protocol television (IPTV), radio, industrial, and other applications, as well as timers, switches, remote controls, and dual-tone multi-frequency (DTMF) encoders and decoders. The company also develops HALO, a specialized management system for overseeing electronic alert system encoders and decoders.