This product is designed based on the needs of agricultural irrigation, animal husbandry and factories, etc to detect water lever so as to control water level relay. Features: It Features compact size, simple wiring, low power consumption, high switching capacity, anti-interference and stable functionality. Able to automatically turn on water pump switch when water level drops low, and stop when water pool is full. Users don't need to buy sensor probes separately, because probes can be replaced by household wiring cables. This product can be used in pond water tank, garage, basement flooding rains place where automatic drainage is required, etc. Ideal choice for automation equipment manufacturers, and also suitable for DIY enthusiasts and students to do experiments. Note: The product does not include lead (probe). Household wiring cable can work as probes. Just strip off the head of cable about 3cm, making it bare for direct induction. It's recommended to weld stainless steel to the cable head, so it will be durable for long term use. Specifications: Material: PCB Item Size: 6 * 5 * 2cm / 2.36 * 1.96 * 0.78in Item Weight: 29g / 1.02oz Package Weight: 29g / 1.02oz Package Size: 11.5 * 8.5 * 2.2cm / 4.52 * 3.34 * 0.86in Packing List: 1 * Water Level Controller Sensor Module