Clocks in this group use AA, AAA, and 9-volt batteries in several configurations (examples: 1 AA, 1 9-volt, 2 AAA, 3 AAA). Listings vary — some mark batteries as optional/not included while at least one notes batteries are required.
The collection includes LED and LCD displays. Digit heights range from about 0.6 inches up to 1.8 inches (examples: 0.6" green digits, 0.7" white, 1" LCD, and jumbo 1.8" LED displays).
Several models offer adjustable brightness or high/low dimmer settings. Multiple listings note explicit dimmer controls or adjustable display brightness, though the exact control style and number of levels varies by model.
Many models plug into AC/electric power and include a battery backup to retain time and alarm settings. A few listings also include a USB charging or USB charge port for charging devices. Specifics vary by model.
Some displays also show the date (month, date and day) and indoor temperature, with temperature shown in °C/°F on certain models.
Listings commonly indicate plastic-based materials such as ABS (Acrylonitrile Butadiene Styrene) and generic plastic. Some models use wood-composite finishes for a different look.
