Large Display -Large digital alarm clock with high resolution shows time,date and temperature clearly on. HD-bright white LED digits ensure that it is clear enough to see the time in the distance.It is ideal for older people, friends, children. 8 Ringing & Snooze Function- This alarm clock has 8 ringtones for you choose,select your favorite sound from 8 alarm tone options. Reject the boring call service ringtones.Pressed the snooze button to get an extra 9 minute nap. (Note: The snooze time can not be set manually) 12 / 24HR & Adjustable Alarm Volume- 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 from 30-90 DP as person preference. Adjustable Alarm Brightness SZELAM Travel alarm clock with 6 brightness levels from 5% to 100%, you do not have to worry that the brightness is too high to affect your sleep, or too dark to read the time. If you only using the battery(Not included),after ten seconds, the screen brightness turns off, press any key, the screen will be bright. If you want to keep the brightness of the screen always maintained, please use the USB cable. Easy Operation & Battery Backup - It is an easy to use LED electric alarm clock with a large, clear display,12 hours / 24 hours, internal temperature, easy to use for children, seniors and older people, no stress when setting the time and alarm.The electric alarm clock use 3*AAA(Not include) battery to remember the time and alarm in case of a power failure. (Note:Battery only for memory function, the alarm clock only works with the USB cable connected)