TW-08-L Type CB EXTENAL Speaker for Mobile Transceiver (CB Radio) with Swivel Bracket 10W 1.8M Cable with 3.5mm Mono L Type Plug Noise Filter Switch & Mute Switch (-8dB)

Works pretty well for ham radio use if you can drive 8ohms. The noise filter and "mute" (pseudo-squelch) buttons don't really do a whole lot. The speaker sounds good, though.

It works great