
2.Power supply:Backlight color prompt for beyond-limit temperature/humidityTemperature/Humidity calibration functionWaterproof grade: IPX4 1. Power supply through USB DC power cable(when the DC cable is plugged in, the backlight indicator turns on for 8 seconds, and then automatically dies out if no buttons are pressed. To keep the backlight indicator constantly on, long press [CLEAR] for at east 2 seconds until the beep sound is heard, andthen enable Always On of the backlight indicator. To disable Always On of the backlight indicator, long press [CLEAR] for at least 2 seconds until the beep sound is heard, and then disable Always On. During the countdown and alarming periods, the backlight indicator is always on, regardless of whether the DC cable is plugged in or not.5