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2. Radar beacon - Wikipedia

   en.wikipedia.org/wiki/Radar_beacon

   Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

3. Crystal earpiece - Wikipedia

   en.wikipedia.org/wiki/Crystal_earpiece

   A crystal earpiece typically consists of a piezoelectric crystal with metal electrodes attached to either side, glued to a conical plastic or metal foil diaphragm, enclosed in a plastic case. The piezoelectric material used in early crystal earphones was Rochelle salt, but modern earphones use barium titanate, or less often quartz.

4. List of WLAN channels - Wikipedia

   en.wikipedia.org/wiki/List_of_WLAN_channels

   Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.

5. Intel PRO/Wireless - Wikipedia

   en.wikipedia.org/wiki/Intel_PRO/Wireless

   Intel PRO/Wireless is a series of Intel wireless products developed by Intel. These products include wireless network adapters, access points, and routers that are designed to provide high-speed wireless connectivity for computers, laptops, and other devices. Intel PRO/Wireless products use various wireless technologies, including Wi-Fi (IEEE ...

6. List of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

   A backdoor found on certain Linksys, Netgear and other wireless DSL modems/combination routers: 32887: Unofficial: Ace of Spades, a multiplayer FPS video game [citation needed] 32976: Unofficial: LogMeIn Hamachi, a VPN application; also TCP port 12975 and SSL (TCP 443). 33434: Yes: traceroute: 33848: Unofficial: Jenkins, a continuous ...

7. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   Audio headset. Appearance. hide. A typical call center/office headset. A headset is a combination of headphone and microphone. Headsets connect over a telephone or to a computer, allowing the user to speak and listen while keeping both hands free.