Feature: 1. 【Wide Application】Suitable for indoor and outdoor, for bedroom, room, office, greenhouse, wine cellar, warehouse, etc. Totally wireless, tabletop and wall-mounted design. 2. 【3 Remote Sensors】Remote sensor for indoor and outdoor use, not waterproof, 98ft/ 30m effective distance, long range measuring. One main unit can pair up to 3 outdoor remote sensors. 3. 【Multiple Data Display】Displays time, calendar, week, indoor and outdoor humidity, temperature, temperature and humidity trend, comfort level, and record maximum and minimum temperature/ humidity. 4. 【Calibration Function】Features calibration function of temperature and humidity to account for any drift that may be present in the system. 5. 【Backlight \u0026 Alarm Function】Backlight off, backlight on (white), upper limit alarm (orange backlight), lower limit alarm (red backlight). Clear display in the dark, about 8 seconds auto off to save energy. 6. 【12H/ 24H \u0026 ℃/ ℉ Switchable】12 or 24 hours time format switchable. Change the temperature display to ℃ or ℉. 7. 【Check/ Clear Records】You can check the maximum or minimum temperature/ humidity in the past. And you can view or clear records. 8. 【Battery Operated】Need USB cable or 3 * AAA battery to power the main unit and 2 * AAA battery to power the sensor. (Batteries not included) Specification: Specifications: Color: White/ Black (Optional) Material: Plastic Application: for Indoor and Outdoor Use Indoor Temperature Range: 0~50℃ (32~122℉) Outdoor Temperature Range: -50~70℃ (-58~158℉) Humidity Range: 20%-99%RH Temperature Display Unit: ℃/ ℉ Selectable Temperature Resolution: 0.1℃/ 0.1℉ Humidity Resolution: 1% Comfort Level: Dry (RH＜50%), Comfortable (15.6-26.7℃, RH 50%-70%), Wet (RH＞70%) Week Display: 8 Languages (English, Russian, Danish, Spanish, Dutch, French, Italian, German) Backlight: about 8 seconds auto off (Power-Saving Mode) Wireless Range: about 100m/ 328ft (Open Distance), 30m/ 98ft (Effective Distance) Power Supply: Main Unit: DC 5V USB Cable (Included) or 3 * AAA Battery (Not included); Sensor: 2 * AAA Battery (Not included) Thermohygrometer Size: 12.5 * 12.5 * 2cm / 4.9 * 4.9 * 0.8in Sensor Size: 10.5 * 3.5 * 3.7cm / 4.1 * 1.4 * 1.5in . Package List: 1 * Thermohygrometer 3 * Remote Sensor with Base 1 * USB Cable 1 * User Manual (English) Note: The remote sensor is not waterproof, please protect it from rain, snow, etc.