Small size, suitable for small FPV carriers.for MOS has low internal resistance and low heat generation, and can also be used in large carriers. AM32 firmware, after enabling sine wave startup and StallProtection, has high low-speed torque and is suitable for climbing cars, like real cars. The same volume BEC has the strongest BEC current output capability, with a continuous 5V 4A or 7V 3.5A output. Model aircraft and car models use brushless electronic tuning,32-bit main control, and support sine wave startup(AM32 firmware). The time traveling machine can also be used to enjoy a smooth experience by flashing the hf32 firmware (defined by tekko32f421).Built in 5V/7.4V 4.5A/3.5A BEC, RC car model available. Please use an external BEC for fixed wings (both ESC and BEC are major heat generators, and prolonged high current output from ESC and BEC can easily lead to overheating protection) Different batches may have different printed characters, but it not affect the use Specifications:Without BEC Color: As shown Material: plastic+metal Package Contents: 1set x Brushless Electric control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.