Features: brand new and high quality L9110 drive , speed control with ZhuanPei mounting holes , screw compatible steering gear steering wheel control high quality , high efficiency. Can easily blow out 20 cm away lighter flame can be used for fire fighting robots , robot for design and development. Working voltage:5V. Board size : 3.49x2.15x0.15cm /1.37x0.85x0.06". Propeller diameter:7.5cm/2.95". Specifications: Working voltage:5V Board size : ( LxWxH ) approx. 3.49x2.15x0.15cm /1.37x0.85x0.06" Propeller diameter: approx. 7.5cm/2.95" Package Includes: 1 x Fan Motor Module note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!