4-channel monitoring for four areas at once. This weather station has a built-in sensor plus 2 wireless sensors, so you can display temperature and humidity for four zones without constantly switching channels. Multifunction hygrometer thermometer. Shows temperature in C or F (switchable) and humidity, with comfort indicators and trend arrows for both readings. Includes low battery alert. Records Max/Min values and auto clears data after 24 hours for quick trend checks. Reliable wireless connection. Equipped with a wireless transmitter operating at 433 MHz, delivering strong signal penetration and a long range of 30 to 100 meters in open air. Readable LCD display. High-definition LCD with large bold digits and a white backlight for easy viewing day or night. Backlight can be automatically turned off after 5 seconds. Practical use scenarios: - Home monitoring: track four rooms (living room, kitchen, bedrooms, entry) from a single unit. - Greenhouse or plant care: place wireless sensors around plants to monitor ambient temperature and humidity where it matters most. - Office or workshop: ensure comfortable working conditions across different areas without manual relays or reconfiguration.