Description: Bidirectional 25A 2-4s UBEC 2A 5V ESC has the function of bidirectional brushless electric regulation. It is applicable to remote control vehicles/ ships/ warships/ car models/ smart cars, etc. Specifications: Item Name: Bidirectional ESC Material: Silicone Wire, Electronic Components Color: Black Size: 55*25*8mm Weight: 24.7g Notes: 1. When using, the remote control throttle remote lever must be in the middle position, otherwise, it cannot start. 2. There is no need to calibrate the throttle stroke. When the electric adjustment is started, if the motor starts to rotate, you can use the remote control to fine-tune the throttle to stop the motor. Package Information:  Package Size: 130*90*10mm Package Weight: 25g Package List: 1 x Bidirectional ESC