JLF building intercom Carrefour, Carrefour visual host JLFZ350-6C, the northern supply center - Liu Xuan-ming 1391,1379,647 JLFZ350-6C technical parameters: Camera: 1/3 "CCD camera camera Operating Current: 230mA ± 20mA Scanning Frequency: 15625Hz 50Hz call number: 3,4 bit Frequency response: 300 ~ 3400Hz ± 3db Operating temperature: -40 ℃ ~ +50 ℃ Installation size: 345X110X35 (mm) Installation: wall gates installed or embedded features: waterproof, cold, anti-shock, feel good. good contact, never card key, life of up to one million times. infrared CCD camera and LED fill light at night so the night can clearly show the images. sensor head can be increased with the built-in card reader and controller authorizing induction IC card lock.