Usage Tips: When a flow of water is detected, the stream head animation will begin to show the water droplets. Total water consumption and flow rate are displayed. The total water consumption is expressed in liters (L) and gallons (GAL). When the total water consumption is less than 10,000 L (or GAL), it will be accurate to two decimal places. When the total water consumption reaches 9999.99 L (or GAL), the decimal point will be displayed. The maximum measurement is 999,999 L. (Note: If the unit is set to GAL, the maximum count is 999,999 L, which equals approximately 219,969 GAL, then it clears to 0.) After exceeding the maximum, remeasurement starts at 0. K Value Setting (K SETTING): The K value setting interface is accessed by entering interface number 00 (K SETTING). This setting allows calibration of the sensor. Total Flow Character (TOTAL): When the system is powered on, the total flow character is displayed on the main screen. Measurement Range: 999,999 L Temperature Display Range: -99 to 999 degrees Celsius. The unit can be switched between Celsius (°C) and Fahrenheit (°F) by pressing the "+" key. Usage Time / Flow Rate Display: When water is flowing, the display automatically shows the flow rate. When no water is flowing, the total usage time is displayed. The total time unit is DAY, with hours also shown. Time units can be switched by long-pressing the "+" key. Flow Rate Unit: LPM is "L/min", GPM is "gallon/min". Units can be switched by short-pressing the "+" key. Battery Indication: The battery alert flashes when the battery is low, indicating it should be replaced. When battery levels are sufficient, no warning is displayed. Water Flow Animation: Visual indication of water flow is shown during operation. System Operation Mode: Powered by three AAA batteries (battery not included). Main Interface and Settings: Color: White Material: Plastic Package Contents: 1 x Water Flow Sensor 1 x Digital Display Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.