Displays three channels and indoor temperature and humidity simultaneously, showing the comfort level of the three-level indoor environment. Indoor temperature measurement range: 0–50°C. Outdoor temperature measurement range: -50°C to 70°C. Indoor and outdoor humidity detection range: 20%–99%. Indicates indoor and outdoor temperature and humidity with trend change display. Records the highest and lowest indoor and outdoor temperature and humidity values. When upper limit alarm is triggered, the backlight turns orange; when lower limit alarm is activated, the backlight turns red with ble alarm. This function holds a utility invention patent. Temperature and humidity calibration function available. Time and date display included. Note: Actual color may vary slightly from the image due to lighting effects. Please allow 1–3 cm deviation due to manual measurement. Net weight: 267g Gross weight: 380g Dimensions: 12.5 x 2 x 12.5 cm Included accessories: Temperature and humidity meter *1, outdoor sensor unit *3, outdoor unit mounting base *3, USB cable *1, user manual in Chinese and English *1 Power supply: Requires 3 x AAA batteries or DC 5V power (batteries not included) Material: ABS