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2. Cellular repeater - Wikipedia

   en.wikipedia.org/wiki/Cellular_repeater

   A cellular repeater (also known as cell phone signal booster or cell phone signal amplifier) is a type of bi-directional amplifier used to improve cell phone reception. [citation needed] A cellular repeater system commonly consists of a donor antenna that receives and transmits signal from nearby cell towers, coaxial cables, a signal amplifier, and an indoor rebroadcast antenna.

3. Digital AMPS - Wikipedia

   en.wikipedia.org/wiki/Digital_AMPS

   The control panel serves as an input/output mechanism for the end user; it supports a keypad, a display, a microphone, and a speaker. The coordinator synchronizes the transmission and receives functions of the mobile unit. A dual-mode cellular phone consists of the following: Transmitter; Antenna assembly; Receiver; Control panel; Coordinator

4. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet. [2] The signal frequency range used by wireless speakers is generally the same as that used by cordless telephones – 900 MHz. The RF signal can traverse walls and floors/ceilings.

5. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   Phone plug mated in a phone socket. The plug's grooved tip is held firmly by the socket's spring tip contact. When not mated, this spring instead connects to the flat switch contact for detecting a plug. TS and TRS plugs of different sizes. A phone connector is a family of cylindrically-shaped electrical connectors primarily for analog audio ...

6. Use this simple trick to make your phone speaker louder - AOL

   www.aol.com/news/2015-08-04-use-this-simple...

   Easier than making cereal for breakfast. Step 1 - Take a bowl. Step 2 - Throw your phone into it. The shape of the bowl will work as an amplifier and the sound coming out of your phone will be ...

7. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   An AV or Stereo receiver (in context often just called a receiver) is a component in a hi-fi or home theatre system combining a radio and audio amplifier in one unit that connects to the speakers and often to other input and output components (e.g. turntable, television, tape deck, and CD and DVD players)