Guide to Alarm Clocks: 6 Types of Alarm Clocks
Written by MasterClass
Last updated: Jun 7, 2021 • 3 min read
An alarm clock is a useful tool that helps people wake up from a night’s sleep or a short nap. Alarm clocks have evolved over the years, ranging from old, plug-in clock radios to wireless projection displays. Learn more about the types of alarm clocks and how they can affect your sleep.