Which of the following are wireless transmitters?

• A. Motion detectors
• B. Smoke detectors
• C. Glass-break sensors
• D. All of the above

Answer: (D)

In alarm systems, a wireless transmitter is any sensor or device that sends its alarm signal to the control panel without a physical wire. Motion detectors can be wireless and transmit a signal when they detect movement. Smoke detectors also come in wireless versions that broadcast an alarm or fire condition to the panel. Glass-break sensors similarly can be wireless and transmit when they detect the sound or vibration of breaking glass. Because each of these device types can operate wirelessly, the correct choice is that all of the above are wireless transmitters. They’re typically battery-powered and use RF communication to report to the panel, with features like tamper switches and supervised reporting to ensure reliable monitoring.