Item Type: RC Motor Driver Material: Iron, copper Color: Silver Rated Power: 150W Working Voltage: 7.4-12V Maximum Speed: 10000-16000RPM Length: Approx. 67mm/2.64in (without shaft) Diameter: Approx. 42mm/1.65n Shaft Length: Approx. 17mm/0.67in Shaft Diameter: Approx. 5mm/0.20in Application: Suitable for all kinds of model boats and remote control boat DIY modifications Package List 1 x RC Motor Driver 1.Please allow 13mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1RC Motor Driver: Good stability, excellent performance, easy disassembly and assembly, perfect replacement for your old or break one. 2Good Heat Dissipation: Made of exquisite shell which enhances heat dissipation performance, and realizes maximum power conversion. 3High Performance: The 775 brushed motor has high torque, low noise and high efficiency for maximum power conversion. 4Parameter: The rated power is 150W, the working voltage is 7.412V, the maximum speed: is 1000016000RPM, the length is 67mm/2.64in (without shaft). 5Easy Installation: Reasonable design, easy installation and disassembly, suitable for all kinds of model boats and remote control boat DIY modification.