1. Automatic and manual working mode The automatic bilge pump is divided into two modes: Blue positive black negative fully automatic operation. Red positive black negative semiautomatic operation. Red and blue cannot be connected at the same time. It must be turned on and off manually. Equipped with an integrated electronically controlled reed sensor system for easy operation. 2. Car with float switch design, fast automatic water removal Integrated float switch of the submersible bilge water pump, no separate float switch required. The automatic float switch turns on when the water level rises above the base height to immediately remove the water from your boat, and turns off when the water is removed. 3. Quiet and vibration operation and low consumption The submersible pump is small, does not require additional space and works silently and vibration. Builtin filter base with spring lock for convenient installation and removal. The automatic bilge pump is extremely efficient, consumes very little power and a high flow rate. 4. Robust material and durable motor All automatic bilge pumps are made of compact, rust and corrosionresistant stainless steel shafts and an impactresistant, durable housing made of thermoplastic plastic. Water cooled motors for long life, with antiairlock design and moistureproof seals. Bilge pumps are equipped with a breakoff strainer for easy cleaning.