Sizes range from compact bedside/table clocks that are only a few inches tall and wide to large decorative wall clocks — some models are listed as large as 26 inches in diameter.
Common materials include various plastics (such as ABS), wood and wood composites, and — on some analog models — glass and metal components.
Projection models typically include an adjustable projector that displays the time on a wall or ceiling, alongside the clock's digital display and alarm-status indicators. Listings often note additional conveniences such as a USB charging port.
Several models offer a battery or time‑backup feature to preserve clock and alarm settings during power outages. These backup options are often optional and may require separate batteries.
Common display types include digital LED displays, LCD screens, and traditional analog faces; product listings typically specify whether the clock uses an LED, LCD, or analog display.
Some bedside clocks include USB charging ports — one model specifically lists a 2‑amp rapid USB charge port. Aside from USB charging, product details generally do not specify other network or wireless connectivity options.
