- Beautiful and delicate blue Power LED, especially charming at night - Black gravel main body coated with dot lacquer; heavy and sturdy construction - Makes extensive momentum of Intelligence Emergency Announcement System - 10 CHANNEL alarming signal inputs, supplied with 10 channels voltage outputs with 24V DC - Supplied with LOW/HIGH input level selective switch for input signals of different high & low levels - Supplied with two signal input sockets at 25P for convenient parallel connection to other equipment