Analog Audio door phone indoor station.
Suitable for 4 (3+1) and 5 (4+1) wires
audio door phone system.
Door release control.
Ringing volume 2-level adjustable.
High quality 100% new ABS plastic.
Wall surface mounting installation.
Working voltage: 9-12VDC.
Working current: <=50mA
Working temperature: -5°C to +40°C
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