The 2402C SL001 is a part of Alpha's water buoys, designed specifically for hydrological and oceanographic instrument storage - it stores and records real-time data on water levels, salinity, temperature, current, and other critical measurements. It is made from glass-reinforced plastic, making it highly durable, and is buoyant, allowing it to withstand strong currents and other environmental conditions. The 2402C SL001 is equipped with an underwater battery for power, as well as an integral radio transmitter for long-range data transmissions.