The PSK-3 is one of the one of the smallest, most durable proximity credentials available. Designed to be carried on a key ring, the PSK-3 is permanently marked with a date code and ID number, includes a brass eyelet for added strength. The PSK-3 is available with standard sequential encoding, and can be programmed in any custom Wiegand format, as well as industry standard 26-bit Wiegand.