An alarm clock is a device designed to wake a person up at a specific time. It typically features a clock face or digital display that shows the current time, along with buttons to set the desired wake-up time. Many alarm clocks also have additional features, such as snooze functions, radio, or nature sounds to make waking up more pleasant. Alarm clocks can be powered by electricity or batteries, making them portable and convenient for travel. They come in various styles, from traditional analog models with bells to modern digital versions with advanced features. Some even connect to smartphones or smart home systems for added functionality.