Features: Two-way synchronization: In the mixing mode, if the single yellow wire is not connected, or the single yellow wire is connected to the receiver "-", the two motors will be controlled by the throttle synchronously. With out-of-control protection: (loss of signal (in an accident, the signal line is broken), for safety, motor for protection, the accelerator needs to be returned to the center and unlocked again. Power failure protection: The power supply voltage is lower than 4V, the ESC restart for protection (for example: high current discharge, the voltage drop of the battery with poor performance is too large, the ESC for protection, the motor stops after the for protection, and after the motor stops, the battery voltage recovers, Back to the neutral point, you hear the motor unlock again) There is overcurrent protection: (but repeated overcurrent in use may also burn.) There is overheating protection: (130 degrees) each motor cable is directly connected to the motor, do not mix it up, otherwise it will damage the ESC BEC output 5v maximum 1.5A to meet your needs for receiving and flight control power supply (note: the on-board microcontroller is also 5V power supply , if you plug the 2S lithium battery directly into the receiver, the microcontroller will burn in seconds ) Specifications: Material:Plastic Size: Approx.4.5x2.1cm/1.77x0.82inch for 35-16 To 1 2S/3S Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x ESC