Alarm Clock

A clock radio is an alarm clock and radio receiver integrated in one device.
The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm. Typically,
clock radios are placed on the bedside stand. Some models offer dual alarm for awakening at different times and "snooze",
usually a large button on the top that silences the alarm and sets it to resume sounding a few minutes later.
Some clock radios also have a "sleep" timer, which turns the radio on for a set amount of time (usually around one hour).
This is useful for people who like to fall asleep while listening to the radio.

The first American alarm clock was created by Levi Hutchins, of New Hampshire, in 1787.

Many alarm clocks have radio receivers that can be set to start playing at specified times, and are known as clock radios.
Some alarm clocks can set multiple alarms. A progressive alarm clock can have different alarms for different times (see Next-Generation Alarms)
and even play music of your choice. Most modern televisions, mobile phones and digital watches have alarm clock functions to turn on or make sounds at a specific time.