Backlight on/off function: The water level monitor features a convenient backlight on/off control, allowing you to easily read the display in any condition. 12H/24H time format: You can choose between a 12hour and 24hour format for the display. The default display when powered on is 0:00 in 24hour format. Transmitter low battery reminder: The water level monitor is equipped with a transmitter low battery reminder, so you are alerted before power runs out unexpectedly. Alarm function: With the alarm function, you can set reminders for specific times or events. The default display when powered on is 0: Practical use scenarios: Home water tank or reservoir monitoring: Use the backlight for easy nighttime reading, switch between 12H/24H formats, and rely on the transmitter low battery alert to avoid gaps in monitoring. The alarm feature can remind you to perform routine checks or maintenance. Aquarium or pet habitat care: Maintain appropriate water levels to protect pumps and equipment. The transmitter alert helps ensure continuous monitoring, while the backlight and clear time display aid quick status checks. Hydroponics or garden irrigation systems: Monitor reservoir levels, schedule watering events with the alarm function, and receive low battery alerts from the transmitter to prevent irrigation interruption. The 12H/24H display option supports different user preferences.