Bluelans Indoor Humidity Thermometer Wall Mount All-in-One Digital Alarm Clock / Thermometer / Calendar / Alarm Economical way to monitor indoor or outdoor temperature and humidity Temperature Range: -50C ~ +70C ( -122F ~ +158F ) , Humidity Range: 10% ~ 99% RH , Temperature Accuracy: 1C (1.8F) , Temperature Resolution: 0.1C (0.1F) , Humidity Accuracy: 5% RH (40% ~ 80%) Display indoor/ outdoor temperature display, indoor humidity, Power-supply: 1.5V (AAA size) x 1(Not Included), Hourly alarm function, Everyday alarm function. Display clock & date display function,2 modes of time display: 12h / 24h. Size: 105mm x 98mm x 20mm/4.13" x 3.86" x 0.79" (Approx.)