Backlight On/Off - The digital water level indicator includes a backlight for easy reading in dim conditions. The backlight can be turned on or off as needed to save power. Time function 12H/24H - Choose between 12-hour or 24-hour time formats. The default display on switch-on is 0:0.0 cm in 24-hour format. Low Battery Reminder - The monitor alerts you when the transmitter battery is depleted, helping ensure continuous operation without unexpected gaps. Alarm Function - An alarm can be set on the monitor. The default display on switch-on is 0:00, and you can adjust the alarm time. Applications - Aquarium or fish tank monitoring to maintain safe water levels and prevent overflow or depletion. - Hydroponics or plant nutrient reservoirs to sustain stable water levels and protect plant health. - Outdoor rain barrels or storage tanks to know when refilling or pumping is needed.