This kit detects the presence of water or any liquid. When a liquid hits
the sensor, this kit emits a sound from the speaker. Use it on any type of
Power requirement 9v battery or 8 to 15 volts DC. (Must be well filtered)
PCB size: 2" x 1".
Sensor size .7" x 2.2"
Here is the instruction sheet for the WD-3 kit.