A combo set that combines a BL-SP4 speed controller and a ZERO-S drift spec motor. It is a speed controller with high cost performance that has the same program items as the top model at a reasonable price, and it is also attractive that it is easy to mount a compact housing on the machine. It is possible to further bring out the performance by combining it with a dedicated programmer (BL-YBP4) or a Wi-fi module. Excellent compatibility with the YD-2 series chassis in combination with the color alumite ZERO-S motor. You will have a machine with clear total coordination.