Features: It can be installed in 1/10 remote control car, suitable for 94123. The sound simulator can be directly attached to the inside of the car body shell, and the mainframe can be attached to the frame or the inside of the shell. Suitable for Flysky gt2, gt2b, gt3c, gt3b, Radiolink rc3s, rc3sAg, futaba. Theoretically, it supports most 2.4G independent receiver. It solves the problem of noise and is equipped with a button to adjust volume. Including ten kinds of sound, suitable for racing car, truck, etc. With built-in memory chip, it will play the sound you used last time. Specification: Material: ABSColor: Shown As PicturesSpeaker Size: Approx. 100 * 45 * 20mm / 3.94 * 1.77 * 0.79inchMainframe Size: Approx. 65 * 37 * 22m / 2.56 * 1.46 * 0.87inchWeight: 83gType: RC Model Part & AccesPackage List:1 * Speaker & Simulator 1 * Glue 1 * Wire