Features: Accuracy Measure -- Built-in industrial grade sensors detects subtle humidity and temperature changes in room and and updates readings every 8 seconds. Easy-to-Read Blackight Display -- Large LCD screen with huge digits and switchable backlight you can read current temperature and humidity at a glance even under dark. Backlit can automatically turn off after 5s to for energy saving. Alarm Clock Function -- humidity meter also display exact date and 12H/24H time and with hourly chime function and alarm clock function press MODE button for a while then press ADJ button can adjust. Max & Min Record -- Press MAX/MIN digital thermometer will display highest and lowest temperature and humidity value in past 24 hours. Degree ℃ & ℉ unit selectable press 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 table. Specification: Module: HTC-1 / HTC-2 / HTC-8A (optional) Color: Dark Blue (HTC-1) / Blue (HTC-2) / Black (HTC-8A) 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 : -10℃-50℃/ 14℉-122℉ Humidity Measure : 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 : Built-in Sensor: 0℃-50℃/ 14℉-122℉ External Sensor: -50℃-70℃/-58℉-158℉ Humidity Measure : 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 : 0℃-50℃/ 14℉-122℉ Humidity Measure : 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