1. Open the upper reservoir, put the filter element into the slot, and then put the upper reservoir back;

2. Fill proper water into the water pool;

3. Insert 4 AAA batteries into the sensor (if you use USB adapter to supply power, this step can be omitted), install the sensor in the bracket, and then install it on the upper reservoir;Or plug the USB cable of the water pump into the USB-A port of the sensor, and then connect the Micro-USB power cable to the Micro-USB port of the sensor, and connect it to the USB adapter. (When using batteries, this step is omitted). 

4. Press the button on the back of the sensor to turn it on, and press it again to switch the working mode. The 3 modes are: the left light is on for continuous working mode, the middle light is on for 1 minute, and the right light is on for 6 minutes.Then press it to turn it off.

5.Use the knob to adjust the water flow speed.