LED Unit Set w/Control Box (12 LESS Diameter: 3mm) Fit for 1/10 RC Car OX: AN Not all the Radio Controller System compatible with this LED control box. Due to limited wire length of the LED lights sel. please per-check proper fixture location before using 3M double-sided tape to fix it. We suggest to fix the LED lights set al the nearest area to the signal receiver which on the bottom of the chassis.