The TFS-Dialog 311 from Auerswald is a versatile doorbell and intercom system designed for operation on analog extension connections of telephone systems. It supports up to four doorbell buttons and can also be used as a light switch. The programming of phone numbers and basic functions is conveniently done via a telephone. The system offers two sensitivity levels to adapt to different ambient noise conditions. The wear-free switching contacts ensure reliable operation for door openers, bells, and lights, with a doorbell transformer required. The integrated LED lighting is energy-efficient and allows for seamless adjustment of the color tone from cool white to warm yellow. Additionally, extra switching options can be implemented through optional a/b switching modules.

• Operation on analog extension connections from Auerswald and other manufacturers
• Two sensitivity levels for different environments
• Wear-free switching contacts for door openers, bells, and lights
• Energy-efficient, continuously adjustable LED lighting
• Additional switching options through optional a/b switching modules.