B.N.G 6" Alarm Clock w/ Date and Temperature Display, Repeating Snooze, Light-activated Sensor Light and Touch-activated Nightlight- Batteries/ USB powered (White) There is a step-by-step INSTRUCTION on this page, just below in Product Description. 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. 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). Power Supply: 3 AAA batteries (last 3 months +) or DC 5V charger.