RC Diesel Engine Simulation Sound Module 5-8.4V Input 2W Small Horn Speaker For Remote Control Car Boat Airplane DIY Model - Install it between the receiver and the ESC, move the throttle stick, and it will emit a corresponding variable frequency diesel sound with the throttle position, making your model more realistic and more playable. - When the throttle stick is in the middle position, the frequency conversion sound is small, and as the stick is moved up and down, the frequency will increase. Specification: - Input: 5 - 8.4V - Board size: 36x15mm - Weight(without speaker): 3.5g - Due to get power from the receiver servo port, make sure that the current of the receiver port is large enough. Package included: sound module with speaker How to connect: