The Ultimate Trucker's Speaker" HighGearTM by Cobra external speakers are designed to offer an exceptional combination of unsurpassed power handling, great sound, rugged construction and stunning looks. The Talkback feature lets you monitor your voice as you transmit. An indispensable tool if you are using an echo mike or signal processor, so that you can make audio adjustments. Additional Features: 15 watt power handling capability 4" speaker with 5.5oz magnet Switchable noise filter Shock-resistant construction Black metal mesh grille Gunmetal gray shell 180° ratcheted swivel mounted bracket Earpiece jack for team drivers 2 year warranty The Black Plug goes to your External Speaker Jack on your radio and the Red plug goes to the PA Speaker Jack on your radio.  NOTE: External speaker is compatible with all Cobra mobile CB radios. The Talkback function is only compatible with models that have a Dynamike control (all versions of the 25, 29, and 148). Will not work with a power mic.