1. Backlight on/off function The water level monitor includes a backlight toggle, allowing easy readability of the display in any lighting condition. 2. Time function 12H/24H Choose between 12 hour and 24 hour time formats for the display. The default on power on is 0:00 in the 24 hour format. 3. Transmitter low battery reminder A transmitter low battery alert helps prevent unexpected power loss by notifying you when replacement is needed. 4. Alarm function You can set reminders for specific times or events. The default display on power on is 0:. 5. Buzzer on/off The key sound can be turned on or off with the buzzer function. This setting does not affect the alarm mode. 6. Indoor temperature °C/°F Displays indoor temperature in Celsius or Fahrenheit. The default setting is Celsius. 7. Product specifications Product specifications are described in the product specification section. 8. Power supply method The receiver can be powered by 3 AAA batteries or a TYPE C power cord. The transmitter is powered by 6 AAA batteries or a built in solar panel that automatically charges the rechargeable battery in sunlight. 9. Temperature and Water Level Measurement The device measures both temperature and water level to provide timely monitoring. Use scenarios Aquarium management: Monitor water level to prevent overflow or low water conditions and track the tank temperature to maintain a healthy environment for fish and plants. The backlight and 12/24 hour display options enhance readability and scheduling reminders for feeding or filtration cycles. Hydroponic or gardening systems: Keep the nutrient solution level within the desired range while monitoring ambient temperature to support plant health. Use the alarm and reminder features to time nutrient changes or system maintenance. Outdoor water storage or rain barrels: Place the transmitter outdoors where a solar panel can recharge the battery, while the receiver stays indoors or in a shed. Low battery alerts help ensure continuous operation, and the 0:00 default display provides a clear daily reference.