Hobbywing Seaking Waterproof 30A V3 Brushless ESC Speed Control : Boat

Features

1.1 Excellent waterproof design (rates as IP 67) allows this ESC to work in water without any extra precautions;
1.2 High quality components have very strong over-current withstanding capabilities;
1.3 High-efficiency water cooling system can easily dissipate the heat produced in operation under high load;
1.4 The special firmware designed for RC boats can make the acceleration punchier and the sailing more stable;
1.5 Multiple protections like low-voltage cutoff protection, thermal protection and throttle signal loss protection, make the ESC more reliable;

Specification

2.1 Continuous Current: 30A
2.2 Peak Current: 180A
2.3 Input: 2-3S Lipo
2.4 BEC Type: Linear Mode
2.5 BEC Output: 6V/1A
2.6 External Programming Port: Not available. But the Rx wire on the ESC can be used to connect the LED program box with ESC. 
2.7 Boat Applicable: Boat length <45cm
2.8 Water Cooling Pipe (Inside / Outside): ?2.0 / ?4.0
2.9 Size (Include the Water Cooling Pipe): 54.5X28.3X18.7mm
2.10 Weight: 41g