Combo packages solve a problem of our inexperienced customers struggling with wiring FM exciter with stereo encoder and IO board. So we came up with the concept of PRT (Practically Ready to Transmit) combo packages. These packages come with exciter, stereo encoder and sometimes also RDS and IO board. All these boards are wired together and tested so teoretically all you need to do is connect antenna and apply supply power. However we strongly encourage you to install the boards in an enclosure, preferably metal enclosure with a small fan (40×40 should work). Running without a small fan or metal enclosure does not insure sufficient cooling and is not recommended.