PVC made proximity cards are used for door accessing and other type of accessing purpose. These 0.8 mm thick low frequency cards have embedded metallic antenna based coil for storing specific data of card holders. An electronic  reader is used to detect the presence of these cards when these are used within detection range of that reader. These non contact based smart cards are identified with the generation of a beep sound produced by electronic reader by maximum 50 cm range. Double sided proximity cards are rectangular in appearance and these remain activated when placed or inserted by maintaining maximum 5 cm distance from the user.