![]() ![]() Most modern televisions, computers, mobile phones and digital watches have alarm functions that turn on or sound alerts at a specific time. A progressive alarm clock can have different alarms for different times (see next-generation alarms) and play music of the user's choice. Some alarm clocks can set multiple alarms. Many alarm clocks have radio receivers that can be set to start playing at specified times, and are known as clock radios. Alarm clocks are also used in mobile phones, watches, and computers. A classic analog alarm clock has an extra hand or inset dial that is used to specify the time at which the alarm will ring. To turn off the sound or light, a button or handle on the clock is pressed most clocks automatically turn off the alarm if left unattended long enough. Some have sensors to identify when a person is in a light stage of sleep, in order to avoid waking someone who is deeply asleep, which causes tiredness, even if the person has had adequate sleep. Most use sound some use light or vibration. The primary function of these clocks is to awaken people from their night's sleep or short naps they are sometimes used for other reminders as well. An alarm clock (or sometimes just an alarm) is a clock that is designed to alert an individual or group of individuals at a specified time. ![]()
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