Strong wireless signal - Equipped with a wireless transmitter, it has the characteristics of strong wireless signal penetration (433MHz frequency) and long transmission distance (open air 30-100m/98-328ft), and can receive signals in time and quickly within the transmission range.Upgraded HD LCD Screen - The indoor and outdoor thermometer has a visual LCD screen with clear numbers and large bold numbers that can be seen from far away in the room, especially suitable for people with poor eyesight, such as the elderly.Multi-Functional Thermometer - Simultaneously displays indoor/outdoor temperature and arrow trend of outdoor temperature. Press the 'C/F' button to toggle F/C to display the temperature that suits your personality. (outdoor temperature: -30-50/-22-122; indoor temperature: 0-50/32-122).Maximum and minimum value recording - the temperature will be updated in time, and you can press the 'MAX/MIN' button to read the maximum and minimum values of the temperature. Or you can press and hold the 'MAX/MIN' button to clear the memory of the MIN/MAX data and receive again.Elegant round design with 2 mounting options - Digital Thermometer Hygrometer with tabletop support and wall-mounted design, ideal for indoor use, such as offices, hotels, greenhouses, hatching rooms, nutrition rooms, schools, laboratories, baby rooms , Hospital ls and so on.