Small expandeble audio door phone system for double houses with one common entrance. This door phone system can be expanded up to 32 appartments and if needed a proximity or magnetic card acces controll system can be added. 

Features:
Ring Bell chord music for 30 seconds
Wiring 4-cord bus wire from door station to indoor phone
Call Function Dual communication between door station and handset is available.
Door Release function (The door station will release a direct voltage of 1 ampire for one second when the unlock button pressed.)

Specifications: 
• Opening conversation; 
• Dual communication; No time limit for conversation; 
• Aluminum entrance panel; 
•Auto-illuminated keyboard at night. 
 •An ancillary system is necessary if one floor with 3 or 4 apartments; 
Accessory door station panel provides 2*10 and 2*12 families for your selection. (Note: main door station panel 2*6 matches accessory door station 2*10, main door station panel 2*8 matches accessory door station 2*12) 
• The system is compatible with WL-02Ba; 

Product specification:
Power Source Transformer ( AC 110V to 240V )
Assurance_temperature -40~+ 50oC
Max_Wiring Distance 200 meters from door station to indoor phone
Dimension: Door station  174 x 130 x 52 mm (1*2) 
Weight : 0.54kg

Paackage content:
1x Outdoor Door Station (1*2) 
1x Doorphone (D-shell model)
1x Power Supply

Options:
• Door panels:

(1*3/1*4)  216 x 130 x 52 mm 
(1*5/1*6)  254 x 130 x 52 mm 
(1*7/1*8)  304 x 130 x 52 mm 
(2*6) 254 x 130 x 52 mm  
(2*8) 304 x 130 x 52 mm

• Door phone Nextved WL-02BFD1
• Uinterruptble Power Supply

Remark: This system must be installed by a skilled electrician.