straight-way video intercom system outerdoor station : CS-200ZV-1 indoor phone : CS-300V-2, CS-300V-3, CS-300V-4, CS-300V-5 with black & white or color fittings : Power ( CS-12V or CS-18V ) Module( CS-YMQ ) 1 outerdoor station + 1 indoor phone = 1 set Functions: 1)Applies to 2x7 or 3x7 building 2)Indoor station adopt 2-pair cable. Any fault of extension won''t impact on normal operations of the system 3)Outdoor station is subject to intelligent control by microcomputer chip ensures a stable running 4)The talks through indoor unit are kept secret Specification: 1) Power Supply: DC12V 2) Power Consumption:100MA/300MA 3) Chime:dingdong chime more than 80dB 4) Distortion: less than 8% 5) Audio SNR: more than 55dB 6) Operation temperature:-10deg+ 55deg 7) Camera: 1/3" CCD/CMOS,Lens: F=3.6 8) Installation: embedded