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2. 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.

3. Cordless telephone - Wikipedia

   en.wikipedia.org/wiki/Cordless_telephone

   Some cordless phones formerly advertised as 5.8 GHz actually transmit from base to phone on 5.8 GHz and transmit from phone to base on 2.4 GHz or 900 MHz, to conserve battery life. The 1.9 GHz band is used by the DECT 6.0 phone standard and is considered more secure than the other shared frequencies.

4. The 7 Best Cordless Phones That Combine Simplicity and ... - AOL

   www.aol.com/7-best-cordless-phones-combine...

   KX-TDG863W Cordless Phone. With two-way recording, bilingual talking caller ID, hearing aid compatibility, automated call blocking, and intercom support, this model delivers an impressive array of ...

5. Speakerphone - Wikipedia

   en.wikipedia.org/wiki/Speakerphone

   Many cordless telephones have a handset speakerphone as well as a base speakerphone. The handset speakerphone allows hands free conversations away from the base unit. The base speakerphone is located in the base unit. The user must be at the base unit, but still gets the added benefits of having hands free conversations.

6. Transceiver - Wikipedia

   en.wikipedia.org/wiki/Transceiver

   A cordless telephone uses an audio and radio transceiver for the handset, and a radio transceiver for the base station. If a speakerphone is included in a wired telephone base or in a cordless base station, the base also becomes an audio transceiver.

7. Telephone - Wikipedia

   en.wikipedia.org/wiki/Telephone

   The base station often includes a microphone, audio amplifier, and a loudspeaker to enable hands-free speakerphone conversations, without needing to use a handset. The base station may also have a numeric keypad for dialing, and a display for caller ID. In addition, answering machine function may be built in. [37]