Features: Accuracy Measure -- Built-in industrial grade sensors detects subtle humidity and temperature changes in room and outdoor and updates readings every 8 seconds. Easy-to-Read Blackight Display -- Large LCD screen with huge digits and switchable backlight, you can read the current temperature and humidity at a glance even under dark. Backlit can automatically turn off after 5s to for energy saving. Alarm Clock Function -- The humidity meter also display exact date and 12H/24H time, and with hourly chime function and alarm clock function, press the "MODE" button for a while then press the "ADJ" button can adjust. Max & Min Record -- Press "MAX/MIN" digital thermometer will display the highest and the lowest temperature and humidity value in the past 24 hours. Degree & unit selectable, press the back / button under to switch. Wide Application & More Mounting Options -- Suitable for baby's room, nursery, office, closet, incubator, greenhouse, garden, wine cellar, basement critter terrarium etc. With hanging hole and retractable stand, easy to mount it on wall or simply placed on the table. Specification: Module: HTC-1 / HTC-2 / HTC-8A (optional) Color: Dark Blue (HTC-1) / Blue (HTC-2) / Black (HTC-8A) Power Supply: 1 x AAA 1.5V battery (Not Included) Display Function: Temperature Unit: / Switchable Time: 24H / 12H Switchable Time Report: Report hour Alarm Clock: 1 Group Resolution: 0.1 1%RH Memery: MAX, MIN Installation: Stand, Hanging Up HTC-1 Digital Themometer Hygrometer: Temperature Measure Range: -10-50/ 14-122 Humidity Measure Range: 10%-99%RH Accuracy: 0.1 5%RH Data: Month, Day ( Press Mode to Check) Size: 94 * 85 * 23mm/3.7 * 3.3 * 0.9in HTC-2 Digital Themometer Hygrometer with Backlight: Temperature Measure Range: Built-in Sensor: 0-50/ 14-122 External Sensor: -50-70/-58-158 Humidity Measure Range: 10%-99%RH Accuracy: 1 5%RH Data: Month, Day ( Press Mode to Check) Backlight: Switchable Exterior Sensor Probe: 1.45m Size: 105 * 98 * 23mm/4.1 * 3.9 * 0.9in HTC-8A Digital Themometer Hygrometer with Backlight: Temperature Measure Range: 0-50/ 14-122 Humidity Measure Range: 10%-99%RH Accuracy: 1 5%RH Data: Year, Month, Day Size: 105 * 98 * 23mm/4.1 * 3.9 * 0.9in Packing List: 1 * Digital Thermometer Hygrometer 1 * User Manual