Apparatus for use in security control; cards encoded with security features for authentication purposes; cards encoded with security features for identification purposes; domestic security installations for buildings (electric or electronic); electric security apparatus for buildings; electric security apparatus for the detection of intruders in buildings; electric security apparatus for the prevention of theft from buildings; electrical security devices, other than for vehicles; electronic security apparatus for use in homes; electronic security apparatus for use in offices; electronic security tags; electronic tags for security control purposes; encoded cards for operating security apparatus; security apparatus incorporating lights for use in buildings; security apparatus incorporating lights for use on the exterior of buildings; security passes (encoded); alarm signalling apparatus; alarm signalling receivers; alarm signalling transmitters; alarms; personal alarm apparatus; personal alarms; personal alarms incorporating lights; personal protection devices (electronic alarms); remote alarms (other than anti-theft for vehicles); safety alarms (other than for vehicles); warning alarms (other than for vehicles)