Security system providing lockout for invalid access attempts

Security system remote control

Security system with membrane switches to detect binary code on

Security system with memory in transmitter and receiver

Security system with multiple levels of access

Security system with random number remote communication

Security system with randomized synchronization code

Security system with security access database distributed among

Security system with succession of codes

Segmentable addressable modular communication network hubs

Selectable checking of message destinations in a switched parall

Selection and control

Selection and power reset circuit

Selective call communication receiver

Selective call communication system with remotely generated repe

Selective call controller

Selective call device and method for battery saving during infor

Selective call device and method for providing a stream of infor

Selective call device and method of subscribing to information s

Selective call message management