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Aiming the pistol-shaped control at an individual photocell could turn the receiver on and off, mute the sound and change the channel up or down. [3] [4] Polley also worked on the push-button car radio and contributed to the development of video disks. [1] Polley's career at Zenith included positions as a product engineer and mechanical engineer.
The Zenith Flash-Matic was the first wireless remote control, invented by Eugene Polley in 1955. It had only one button that was used to power on and off, channel up, channel down, and mute. The Flash-matic's phototechnology was a significant innovation in television and allowed for wireless signal transfer previously exclusive to radio. [1] [2]
Ranger's creation was a music box-style electro-mechanical device, which played the three-note sequence at the push of a button. [ 27 ] [ 28 ] The initial installation was made at New York City headquarters, and went into operation on September 18, 1932. [ 9 ]
Mobile radio telephone systems were mobile telephony systems that preceded modern cellular network technology. Since they were the predecessors of the first generation of cellular telephones, these systems are sometimes retroactively referred to as pre-cellular (or sometimes zero generation , that is, 0G ) systems.
Pressing a button on the pendant contacts a Life Alert call center, and a Life Alert dispatcher then contacts 9-1-1. The company requires service contract with a minimum term of three years. Some people call life alert and have them transferred to their dispatch office and a 911 operator [3]
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Multiple walkie-talkies use a single radio channel, and only one radio on the channel can transmit at a time, although any number can listen. The transceiver is normally in receive mode; when the user wants to talk they must press a "push-to-talk" (PTT) button that turns off the receiver and turns on the transmitter. Some units have additional ...
A similar feature called "YouTube Radio" for continuous music playback in resemblance to radio stations was tested in February 2015. [150] Since approximately July 9, 2013, the first page of videos' comment section is no longer included in the watch page's static HTML source code, but instead loaded subsequently through AJAX. [151]