Audio Video Doorbell Voice Only Intercom System For Apartment Handset Design With Unlock Button

ABS Plastic
Indoor phone  for the high and multi-storeys buildings.
MCU intelligent controlling and short-circuit automatically self-inspection reduces the cost of maintenance.
Circuit is double-sided patch and moisture proof with high reliability.
Any outdoor unit can be expanded with access control and compatible with the audio phones.
Several unlocking passwords available to set.

It can revise all the parameters like ring type and unlocking time by keyboard adjustment.
All kinds of electronic lock,magnetic lock etc for the system.
Special hands-free intercom circuit design provides voice without squeal