Keri's PSC-1 Standard Light Proximity Card provides maximum read range performance in a package considerably thinner than other "clamshell" proximity cards. It can be easily carried in a wallet or purse or worn on the clothing with a clip or necklace. The cards are extremely durable. They are for use with Keri's new Pyramid Series Proximity Readers which can be used on any manufacturer’s access control system. They are manufactured with a vertical hanging slot punch and can have an optional horizontal slot punch added. The cards are sequentially encoded, and can be programmed in any custom Wiegand format as well as standard 26 bit, all with exact number sequences. Card ID numbers are permanently marked on the card. They can be used interchangeably with Keri's Multi-Technology Cards or Key Ring Tags on the same system without worry about ID code duplication or format matching of readers. It can accept standard imageable PVC labels from a multitude of vendors for graphics customization and photo ID. Unless the user requires the combination of mag stripe and proximity, the Standard Card is recommended over the Multi-Technology Card whenever possible because of its lower cost.