There are four trigger levels associated with this product, while the CSO sensor is a complete solution with self-sustained battery, suitable for combined sewer systems. This item is required in areas where storm water represents a hazard and creates water pollution. This product is also able to transmit SMS alerts, in the case of predefined sewage-water levels, and can transmit and level information periodically. The construction is a rugged one and can withstand overflow, being rated IP68.