Biometric key

A biometric key (10) having a key body (13) incorporating a biometric sensor (14). There is also provided a receptor body (18) for engagement with the biometric key, wherein the reader has a slot for retention of the key. When the key (10) engages with the receptor body (18), a signal representing a biocode of data generated by the biometric sensor (14) is forwarded to processing means for granting access to an authorised user to a facility accessible by the biometric key.