1. PCB design is more reasonable, using square copper bars instead of cylindrical copper bars to reduce heat generation. Increase the wiring pad so that more heat can be exported through the wire. 2. Fine . 3. PCB technology upgraded: Process of adding resin plug holes, holes in the tray, and half holes on both sides to the control board. Upgrade the power board. 4. The overall design is more reasonable, with the heat sink directly touching the MOS tube, and the heat dissipation capacity is MAX. Item name: brushless ESC Working voltage: 7V-26V (3-6S) Persistent current: 75A Transient current: 85A MOS tube model: IRF7480MTRPBF 32-bit main control, supporting sine wave startup Used for RC drone model airplane Specification:B:no onboard BEC: equip with 1pcs 50V 470uF electrolytic capacitor and 1pcs heat sink Note:The default ESC(no onboard BEC) parameters can be used for aircraft models or transit aircraft. If vehicle use is required, need welding an external BEC(not include, prepared by yourself), and please adjust the parameters yourself. The PCB board has green and black two colors. Due to different batches, the color of the board is randomly sent.Specified color is not accepted. Colour:As Shown Material:PC Package Contents: 1pcs x Speed Controller(Due to different product batches, the appearance , which does not affect the use) 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.