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An alarm clock is designed to sound an alarm at a pre-determined time. It may be used to awaken someone from sleep or to remind someone of a scheduled event. Learn about analog and digital alarm clocks, and shop for antique, vintage, and contemporary alarm clocks. Compare clock radios and travel alarms offered by selected clockmakers.

An atomic clock contains an atomic oscillator, and measures the passage of time via the oscillator's frequency. However, many so-called atomic clocks and watches are really radio-controlled timepieces which download the correct time periodically from an atomic clock located in Colorado. Compare radio-controlled timepieces offered by selected atomic clock and watch makers.