We developed and presented various digital audio/video surveillance systems for the most different fields of application. The PKI 5040 A/V Day/Night Vision Camera is also required for important surveillance operations at night and is an indispensable part of professional equipment. This A/V day/night vision camera offers all specifications already described for our other PKI A/V systems. Additionally, however, the integrated IR LEDs of the PKI 5040 switch on in the dark or in case of bad lighting conditions and illuminate the surveillance area. A/V storage is realized with the inserted micro SD card and is analyzed with a computer using the special PKI software.