Many bedside digital clocks include USB charging ports (one listing specifies a 2 AMP USB charge port). Some models also add Bluetooth and a built-in speaker for audio playback or streaming.
Beyond the clock face, some digital clocks include ceiling/wall projection, nightlights or wake‑up light indicators, built-in sound machines or ambient light rings, and calendar/date displays.
Sizes vary, but examples range from compact bedside clocks around 2.3 inches high to larger tabletop models up to about 5.63 inches high. Most described models are compact enough to fit on a standard nightstand.
Projection clocks use an adjustable projector arm to shine the time onto a wall or ceiling (some examples project the time in red). They typically keep a standard digital display and may also show calendar or date readouts.
Digital clocks use LED and LCD displays. Display sizes in listings range from jumbo 1.8" LED digits to smaller 1" LCD readouts, with many descriptions noting digits that are easy to read from across a room.
Many clocks include adjustable brightness or dimmer controls. Options vary from simple high/low dimmer settings to multiple brightness levels; review notes frequently highlight display brightness and available dimmer settings.
Listings show plug-in (electric) clocks often with optional battery backup to preserve time and alarms, battery-operated models that use AAA cells, and at least one listing that mentions an included lithium‑ion battery.
Common materials and finishes include plastic and ABS cases, wood composite or wood laminate finishes, and fabric‑covered faces (examples note neutral gray fabric and wood laminate options).
Kid-focused clocks may include wake‑up lights or 'OK‑to‑wake' green indicators, built‑in nightlights, adjustable display brightness, easy‑to‑read digits, simple controls and playful shapes, along with standard alarms, snooze, and time‑backup features.