Proximity card (or Prox Card) is a generic name for contactless integrated circuit devices used for security access. It can refer to the older 125 kHz devices or the newer 13.56 MHz contactless RFID cards, most commonly known as contactless smartcards. There are also now higher frequency varietion for longerMore …

Image sensor is the most important component for any CCTV security camera. This image sensor converts light into a digital signal. The two most basic types today are CCD (Charged Coupled Devices) and CMOS (Complementary Metal Oxide Semiconductor) sensors. For those novice or seasoned technie, it sometimes may just beMore …