Weight right at 13oz.Uses Program Box to program. 300 Amp burst.  States waterproof but not designed to operate saubmerged.Hifei Swordfish Pro+ II High Voltage, 240 amp ESC with Water Cooling and Data Logging.**In order to program, all Pro and Pro+ ESCs require either the USB Programmer (hef-h#0003) or the Program Box (hef-h#0004)** This is a high quality ESC designed specifically for racing boat. With the new data logging feature, you will be able to take the guess work out of prop, motor or strut changes by logging the following info, Current/Amps, Voltage, Temperature, RPM, Power & Throttle travel. Programing can be done with optional program card, USB adapter (Requires Windows xp, Vista or Win 7(will not work on Windows 8) or optional LCD Program Box/Handheld Unit. This unit is encased in rubber, making it very water resistant. Key Features:- Microprocessor controlled- Extremely low resistance (0.00075 ohm)- 240A continuous (300 Burst)- Up to 38cells NiMH/NiCad or 4 to 12 cell Lithium-polymer- High rate adjustable switching (PWM:8KHz/12KHz/16KHz)- No BEC (battery eliminator circuit)- Programmable low voltage cutoff- Programmable cutoff types(soft cutoff/hard cutoff)- Timing advance programmable (low/standard/high)- Programming by Hifei Program Card or USB Linker- Firmware Upgradeable- Programmable startup type(very soft start/soft start/fast start)- Thermal Protection(100 centigrade)- Runs motor in forward or reverse by swapping any two motor wire connections.- Safe “power on” arming program ensures motor will not accidentally turn on.- Auto shut down when signal is lost or radio interference becomes severe for more than 3 seconds. After radio connection has been reestablished, moving the throttle to the lowest position can restart the motor.- The ESC is disabled when the voltage is over 51v at power-on.- Data Logging Feature Includes: Current, Voltage, Temperature, RPM, Power & Throttle travel (These features require optional USB adapter, downloading/installing the software and you to supply a windows pc.Case Measures: 4.25" (108mm) x 2.25" (57mm) x .90" (23mm)Weights: 310g (10.94Oz)Requires: External battery eliminator circuit or 6 volt pack to power your  receiver.