Thank you i'm reading the articles
here is some propositions that i've got would you tell me wich one is better?
FORTRESS
Camera CCD,1/3 colors , 480 lines, objectif vari-focal 4~9mm, day night , IP-67, 12V, IR 12m, 0,5lux IR actif
IR938H
Caméra infra red , day night , 1/3, Super HAD CCD, hight résolution, 480lines, max 36leds 20 à 25 m, 12 V, 0lux with IR actif, obj.6mm, IP-66
IR-956
Caméra CCD,1/3,color,520 lines,12V or 220V - objectif 6mm, day night ,anti reflexion, IR, 56 leds 30-35m, 0lux withe IR actif
IR938H
Caméra CCD, 1/3 color, 520 lines, 12V objectif vari-focal 3,8~9 ,5mm , day night ,IR , 56 leds 30-35m.