Large Display- 5.5" large digital alarm clock with high resolution displays time, date and temperature clearly. High definition bright white LED digits ensure it is clear enough to see the time at a distance. It is ideal for seniors, friends, kids. ^ 8 Ringtones; Snooze Function- This alarm clock has 8 ringtones for you to choose, select your favorite sound from the 8 alarm tone options. Reject boring call service ringtones. Press the snooze button to get an extra 9-minute nap. (Note: Snooze time cannot be set manually) ^ 12/24HR; Adjustable Alarm Volume- The digital bedside clock has 12/24h mode, you can depending on your habits whether you want to use the official time or 12h AM/PM; Adjustable alarm volume with 6 sounds can be set. set from 30-90 DP according to person preference. ^ Adjustable Alarm BrightnessSZELAM travel alarm clock with 6 levels of brightness from 5% to 100%, you don't have to worry about the brightness being too high to affect your sleep or too dark to read the time. If you only use the battery (not included), after ten seconds, the screen brightness will turn off, press any key, the screen will be bright. If you want to keep the screen brightness always, please use the USB cable. ^ Easy Operation; Battery Backup - It is an easy-to-use LED electric alarm clock with a large and clear display, 12H/24H, internal temperature, easy to use for kids, seniors and the elderly, no stress in setting the time and alarm. The electric alarm clock uses 3*AAA (not included) battery to remind the time and alarm in case of a power outage. (Note: The battery is only for the memory function, the alarm clock only works with the USB cable connected)