battery powered alarm clock

Across the results the listed battery types are 1 AA alkaline, 1 9‑volt alkaline, and 2 AAA alkaline.

Many listings specify either 2 AAA batteries or 1 AA battery; a smaller number list a single 9‑volt. Some models mark the batteries as required, while others note them as optional backup.

Descriptions indicate battery backup is used to retain time and alarm settings during power interruptions rather than to fully run the clock.

Many models list adjustable brightness or dimmer controls, ranging from basic high/low dimmer settings to three adjustable brightness levels.

Features include snooze functions with varying durations, super‑loud alarm options (one model cites up to 90 decibels), ascending alarm volume, and high/low alarm volume controls.

Product details usually specify the battery type and count, whether the battery is optional or required, and note when batteries are not included.

Many of the clocks are compact and lightweight; dimensions and review notes describe them as suitable for nightstands and travel‑friendly use.