BH Body Touch-activated and Light-activated Digital 6" Silent Alarm Clock Sensor Light Nightlight Repeating Snooze with Date Calendar Temperature Display, Black Time (12/24), Calendar (MM/DD), Temperature (C/F), Alarm Status (ON/OFF). Sensor automatically comes on when it's dark around, because it's light-activated. It's soft, making you sleep easily or see time from a distance hands free. It can also be closed. If bright light needed, please touch the top to use nightlight, which lasts 8 seconds. Ascending "beeping" alarm for gentle wake; Snooze repeats every 5 minutes (touch the top of clock to use Snooze). 2 Ways of Power Supply: Battery Backup (3 AAA batteries, not included) or USB powered (USB charger not included). 4.3" x 2" large display and big numbers. Time can be read within 33 feet in the day time or 16 feet at night.