This listing is for 1ea single JBL ST400 Tweeter system by JAHsound, designed for Pro Audio or car audio systems. It has an RMS power handling of 300W RMS 4 Ohm and made in the United States. The tweeter comes in a custom box with rubber feet and a connector panel, providing convenience for installation. This high-quality tweeter system is ideal for enhancing the audio experience in your sound system, delivering clear and powerful top quality sound output.