Building Intercom System | Extension/non Vsual Doorbell Indoor Machine Phone Or Decoder(Decoder)

Building Intercom System | Extension/non Vsual Doorbell Indoor Machine Phone Or Decoder(Decoder)

• As a non-visible indoor unit, it supports standard two-wire/four-wire analog intercom bus and is compatible with mainstream building intercom hosts; it does not require a video module, and the price is only 1/3 - 1/2 of that of the visible extension. It is suitable for batch deployment in apartments, dormitories, and office buildings with limited budgets.
• It is equipped with a high-sensitivity electret microphone and a 1W/2W speaker, supporting hands-free full-duplex calls; it also comes with a handset, allowing for private calls in noisy environments by picking up the receiver, with clear sound without howling, suitable for corridors, workshops, duty rooms, etc.
• It is installed using standard base boxes, with clear connection port markings; it can be directly replaced with faulty or obsolete non-visible indoor units without re-wiring, saving time and effort for property management and tenant upgrades.
• It is equipped with transient suppression diodes and self-resetting fuses, capable of withstanding lightning strike-induced surges; the working voltage range is DC 12–24V or AC 12–18V, adapting to voltage fluctuations in old buildings, and operating continuously without downtime all year round.
• The extension address can be set through the body's DIP switch or jumper cap, and combined with the floor decoder to achieve precise call for each household; it supports 1-to-multiple calls, suitable for large households, offices, clinics, etc. with multi-point response requirements.