This is a HobbyWing 30302401 SeaKing 180A V3 Waterproof Brushless ESC. Bottomline: Excellent waterproof design (rates as IP 67) allows this ESC to work in water without any extra precautions; High quality components have very strong over-current withstanding capabilities; Patented Copper Heat Conduction technology and high-efficiency water cooling system can easily dissipate the heat produced in operation under high load; The special firmware designed for RC boats can make the acceleration punchier and the sailing more stable; The external Programming Port can connect to the LED Program Box for easily setting the parameters of the ESC, Multiple protections like low-voltage cutoff protection, thermal protection and throttle signal loss protection, make the ESC more reliable.