The Frieling Racing Slave cable is designed to be a OBDII device for reading and writing multiple vehicles. What makes the Slave cable different from the Master cable is that it cannot encrypt or decrypt files. The Slave cable is locked to it’s Master device where that Master can encrypt and decrypt for tuning purposes. Slave cables are designed for shops or dealers. Slave cables can only work with purchased protocols. Without proper protocol licensing, they will not work. Price is for the cable only.