This mini microphone kit includes the parts needed to build a small portable microphone for the (tr)uSDX and uSDX, or the Elecraft KX2 and KX3. It is an electret condenser microphone element with PTT button and 3.5 mm jack. 3 foot 3.5 mm male to 3.5 mm male aux cable is included. Basic soldering is required to complete the kit.