These are sold in packs of 10.

125 KHz credit card size 1.7mm thick high security proximity card with fully encrypted format stored on the card. It is thin, flexible, and light enough to be carried in a purse or wallet. It is preprogrammed at the factory with a unique encryption code. It provides a read range up to 4 inches.

Requires an Eternet-enabled HAI controller that has firmware version 3.0 or higher.