"SeaKing" series ESC is specially designed for boat, so it has the water-cooling system and the whole ESC is waterproof.
1 Specification
1.1 Output: Continuous current 25A, burst current 90A.
1.2 Input: 4-12 cells NiMH/NiCd or 2-4 cells LiPo. Note1
1.3 BEC Output: 6V/1.5A.
1.4 Resistance: 0.005 Ohm.
1.5 Motor Supported: Sensorless Brushless Motor
1.6 External diameter of the water cooling pipe: 4.0mm
1.7 Size: 31.5mm(L) * 27.5mm(W) * 24mm(H).
1.8 Weight: 30g(Without wires)

Note1:
For 4-9 cells NiMH/NiCd or 2-3 cells Lipo: You needn·¯t change anything of the ESC.
For 10-12 cell NiMH/NiCd or 4 cell Lipo: You must disable the output of built-in BEC, and use a 3A UBEC to supply the receiver.
2 Features
2.1 Use top quality electronic components to enhance the current endurance ability of the ESC.
2.2 Special designed for RC boat, with excellent start-up, acceleration and linearity features.
2.3 With water cooling system.
2.4 The whole ESC is waterproof.
2.5 With 2 running modes ("Forward Only" mode and "Forward/Backward" mode).
2.6 With brake function.
2.7 With 8 steps of timing adjustment to get the best compatibility with various of motors.
2.8 Multiple protection features: Low voltage cut-off protection for lithium or nickel battery / Over-heat protection / Throttle signal loss protection.