Product specifications LED table and wall clock Show hours and minutes date month and temperature Adapter works DC5V (included) product description 1. Time format is optional: 12/24 hours; 2. Backup battery internal hold time equipment works once DC power is off 3. Time accuracy: daily deviation <0.5 seconds 4. Temperature measurement range: -9 to 45 C accuracy is ± 1 C time deviation (24 hours ≤ ± 1 second) 5. Installation: indoor wall mount installation