The VideoRay Pro 4 is the culmination of more than a decade of ROV design and development. Building off the success of the VideoRay Pro 3 model, the Pro 4 incorporates the latest in small ROV design and technology making it the most advanced, capable, and versatile small ROV on the market today. Completely computer driven by a sleek, intuitive, and powerful new software platform called VideoRay Cockpit, the Pro 4 is more advanced than anything else offered in its class. With the Pro 4 ROV hardware in position, incorporating new features such as vehicle autonomous control, the latest imaging sonar and positioning hardware and software, or a variety of other sensors and tools developed around the size and capability of the Pro 4 couldn't be easier. Following VideoRay's proven ideals of making our ROV systems and accessories "plug and play," capabil- ities can be added or subtracted with either a simple software update or a quick hardware add-on in the field - all without the system being sent back to the factory. The Pro 4 has a host of advanced internal features that position it above other vehicles in its class such as a 3D tilt compensated compass, Accelerometer, MEMS Gyro, a leak alarm, internal temperature gauge, and an operating volt meter. These features are designed to make the pilot's life easier and give advance warning in the case of an issue with the vehicle. BASE SPECIFICATIONS Submersible Dimensions: Submersible Weight: » 6.1 kg (13.5 lb) with Full Ballast Set Submersible Thrust to Vehicle Weight Ratio/Speed Depth Rating: