Alpha IA543 5/4/3 Wire Apartment Amplifier+2 Tones

5/4/3 Wire Apartment Amplifier+2 Tones Requires 16VAC Transformer Model SS102A / SS105B SS106 T1640 or Equivalent. The Alpha Communications® IA543 Power Pack Amplifier is a self-contained unit not requiring an external amplifier. designed for use with 5, 4 3 speaker type stations and provides amplification, control circuits needed to operate complete intercom system. Voice volume tone are easily adjustable through screwdriver slot on front panel. It also direct replacement previous model(s) PK543 PK543A.

Additional functions include multiple entrance operation IA502; AC, DC Maglock configurations three (3) selectable door timing modes; post office lock release; steady warble call tones; LED; button hold timeout; Talk before interlock.