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2. Alarm clock - Wikipedia

   en.wikipedia.org/wiki/Alarm_clock

   A mid-1940s alarm clock radio with AM radio stations only A typical 1980s clock radio featuring a digital clock/alarm and an analogue FM/MW/LW receiver. A clock radio is an alarm clock and radio receiver integrated in one device. [18] The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm.

3. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   Radio clocks may include any feature available for a clock, such as alarm function, display of ambient temperature and humidity, broadcast radio reception, etc. One common style of radio-controlled clock uses time signals transmitted by dedicated terrestrial longwave radio transmitters, which emit a time code that can be demodulated and ...

4. Time from NPL (MSF) - Wikipedia

   en.wikipedia.org/wiki/Time_from_NPL_(MSF)

   The Time from NPL is a radio signal broadcast from the Anthorn Radio Station near Anthorn, Cumbria, which serves as the United Kingdom's national time reference. [1] The time signal is derived from three atomic clocks installed at the transmitter site, and is based on time standards maintained by the UK's National Physical Laboratory (NPL) in Teddington. [2]

5. Sony Dream Machine - Wikipedia

   en.wikipedia.org/wiki/Sony_Dream_Machine

   A clock radio that has a different alarm sound and has a volume control and two different alarms. This one comes in the MK2 version as well, It has a red LED display, and for the MK2, it has a green LED display. The first alarm is a radio alarm and the second one is the buzzer, Two bands; FM and AM.

6. Atomic clock - Wikipedia

   en.wikipedia.org/wiki/Atomic_clock

   A radio clock is a clock that automatically synchronizes itself by means of radio time signals received by a radio receiver. Some manufacturers may label radio clocks as atomic clocks, [151] because the radio signals they receive originate from atomic clocks. Normal low-cost consumer-grade receivers that rely on the amplitude-modulated time ...

7. Flip clock - Wikipedia

   en.wikipedia.org/wiki/Flip_clock

   Many vintage digital clocks with split flap displays cannot be wound back, as the flip mechanism operates only in one direction. Instead they must be either wound forward 23 hours to achieve the effect of winding back 1 hour at the end of daylight saving time or the clock may be stopped (by disconnecting it from power) for 1 hour.