Products Functions: 1. Time display: support 12 or 24 hour time, show hours and minutes;  2. Calendar display: Show month and day;  3. Temperature display: Support Celsius or Fahrenheit mode;  4. Countdown for 999 days 99 hours 99 minutes;  5. Count up for 99 days 99 hours 99 minutes;  6. There are total 16 different alarm settings;  7. There are 8 levels different brightness can be adjusted;  8. Come with an internal button cell battery(CR2032) to keep time when the power goes out;     Features: Large LED digits: People can easily see time at 50 meters away;  Silent, Non-ticking;  Mains powered, battery back. So when the power goes out it keeps time;  Application: Living Room, Meeting Room, School, Office, Workshop, Classroom, Coffee House, Hotel, Sports, Games, Lounge, Caravan and so on;     Specification: 1. Input voltage: AC100-240V, 50/60Hz, Output: DC5V, 2A;  2. Material: Acrylic;  3. Product dimension: 45 x 16 x 2cm;  4. Weight: 800g;  5. Time error < 10 seconds a year;  6. Temperature error < 0.5 degree;  7. Volume:0-80db;  8. Temperature range:-30~80 degree;  9. Battery type: CR2032 button cell battery;     Package included: 1 x LED Wall clock;  1 x Remote;  1 x English User manual;  1 x Power adapter