Function Introduction:1. Time display: The clock defaults to AM12:00 when turned on2.12 hour clock and 24-hour clock can be switched, default is 12 hour clock3. Calendar display: The default display upon startup is January 1, 2020 at 12:00 AM; Default date display format: M-D4. There are 8 countries for the language of the week, and the order of their settings is: EN (English) - GE (German) - IT (Italian) - FR (French) - NE (Dutch) - ES (Spanish) - DA (Danish) - RU (Russian). When turned on, the default display is: EN (English)5. Indoor temperature display: 0 C~50 C (32 F~122 F) Error: 1 C6. Indoor humidity display: 20%~99%7. Outdoor temperature display: -50 C~70 C (-58 F~158 F) Error: 1 C8. Outdoor humidity display: 20%~99%9. Temperature unit switchable display: C/ F Default display unit: Temperature []10. Record of maximum/minimum indoor and outdoor temperature and humidity values11. Three level arrow indication of indoor and outdoor temperature and humidity trends12. Three level graphic display of indoor and outdoor temperature, humidity, and environmental comfort13. Indoor temperature and humidity upper/lower limit exceeding limit sound alarm prompt14. Indoor temperature and humidity upper/lower limit exceeding limit backlight color alarm prompt: Orange yellow backlight prompts temperature and humidity upper limits; Red backlight indicates lower temperature and humidity limits15. Outdoor three channel temperature and humidity data displayed on the screen16. Temperature and humidity calibration function17. Wireless transmission distance: The open distance is 100 meters18. Screen size: 4.72 inches19. Body material: ABS20. Product certification: FCC certification; FCC test report; CE certification; CE test report; ROHS certification; ROHS Test Report Temperature and Humidity Accuracy Report21. Power supply method: Receiver: USB data cable/3 * AAA battery power supply; Transmitter: Powered by 2 * AAA batteries (note: batteries are not included in product shipment!)Specifications:1. Product size: Receiver: 12.5 * 2 * 12.5cm Transmitter: 5 * 3.7 * 10.5cm,2. Single product packaging size: 18 * 7 * 18cm,3. Product weight: 267g,4. Single product packaging weight: 380g,5. Product color: Black,Packing list: Product * 1+transmitter * 3+transmitter base * 3+USB data cable * 1+bilingual instruction manual in Chinese and English * 1+foam lining * 1 * foam+1 * color boxNote: 1. Due to different lighting effects, the actual color may differ slightly from the image. 2. Due to manual measurement, please allow a deviation of 1-3cm!