This  is a (PTT) microphone case for the Bitx40 or uBitX QRP radio kits. These kits include an electret microphone element and a pushbutton switch. In addition to theses two items, you will need to purchase one 3.5mm stereo jack**, and two M3x10mm screws. This project requires wiring and soldering to connect the microphone, jack and PTT switch. Refer to the provided wiring diagram. ** Note: Stereo jacks come in all shapes and sizes. The stereo jack used here has a 6mm diameter threaded section and an 8mm diameter main section. You will need to find one that meets these specs in order for it to fit into the case.