The Klein Electronics Agent-CO K1 is a top - notch single - wire earpiece. It features a robust D - ring earloop and a high - quality, clear - audio speaker that comfortably rests on your ear. With an in - line PTT button and microphone, it's an ideal choice for shift workers who need to share earpieces. You can use it on either your left or right ear. This earpiece is compatible with a wide range of radios. For Blackbox, it works with Zone, Bantam, and Club models. In the Kenwood lineup, it fits numerous radios like the TK208, TK220, and many others. It's also compatible with RELM's RPV516A, 599A and HYT's TC620.

Using this Klein Electronics earpiece is easy. First, connect the earpiece to your compatible radio. Put the D - ring earloop around your ear, making sure the speaker sits comfortably on your ear. Press the in - line PTT button when you want to talk. For sharing, just pass it to your co - worker. When not in use, store it in a dry and cool place to avoid damage. Keep it away from water and extreme heat. If it gets dirty, gently wipe it with a soft, dry cloth. Don't use harsh chemicals as they may damage the earpiece. Regularly check the connection to the radio to ensure it's secure and working well.