2 Speakers Motor Sound Simulator Kit 10 Engine Sound Effect Module for 1/10 RC Rock Crawler Car Toy 
Main Function:
Let the remote control car model simulate the engine sound of the car and link with the throttle. The sound changes with the throttle. After it is installed, it can simulate the sound of the sports car engine like the real car. Responsive, linked with the throttle, the throttle will steadily produce an appropriate sound at any position.

Specification:
Material: PVC
Colour: Black
Quantity: 1 Set
Line Length: 50cm/19.69"
Remote Control: 2.4G Independent Receiver
ESC ESC: Universal for Brushed ESC And Brushless ESC
Product Size: 99 X 45 X 21mm/3.9 X 1.77 X 0.83"
Suitable for Models: Universal for RC Car Model 
Installation Location: The speaker can be directly attached to the inside of the car shell, and the host box can be attached to the frame or the inside of the car shell.

Main Feature of the Upgraded Version:
1: Improve the problem of noisy idle sound.
2: Added volume adjustment function.
3: Built-in 10 kinds of car sounds, including sports car/trucks, etc., suitable for more models.
4: Bi-Amp, dual speakers.
5: Built-in memory chip, automatically memorize and read the sound type used when it was turned off last time, no need to press again.