Global positioning system (GPS) apparatus; Electron capture detectors; Walkie-talkies; Electronic access control systems for interlocking doors; Alarm monitoring systems; Remote video monitoring system consisting primarily of a camera and video monitor for recording and transmitting images to a remote location; Closed circuit TV systems for security and surveillance, namely, cameras, switchers, monitors, microphones, and recorders; Portable and handheld digital electronic devices for recordin...