Audio speaker unit for Simplebus system, complete with terminal block and digital audio management system with Ecocancelling,
watertight loudspeaker and electret microphone; loudspeaker volume can be adjusted from the front. Complete with microprocessor and
DIP SWITCH with 8 positions for programming calls to users. 33Vdc power supply via special power supply unit Art. SB1595. On-board
electronic lock-release function (3A), plus C, NC, NO 10A relay contacts. For use in modules Art. SB33400, SB33401 and SB33402.
Timed lock-release input and door open indication.