…. though there are many variants of these Keys, all with specialist features for demanding situations. The rechargeable CK-RXD CyberKey (and its successor, the CK-RXD2 with a USB charging and update facility) were the other most popular CyberKeys in the Generation 1 line-up. These Keys reached the end of production in 2000, having been replaced by the much more powerful Generation 2 versions. Further details of other Keys can be provided upon request.