This Mini External Speaker is one of our favorite radio accessories with amazing audio amplifying abilities. It’s small enough to fit in your pocket making it the perfect speaker to take everywhere. The Mini Speaker can plug into any 3.5mm speaker outlet giving you the power needed for high noise environments. You won’t be disappointed by the audio pumping out of this little guy. SPECIAL NOTE WHEN USING EXTERNAL SPEAKER WITH INTERCOM SYSTEM When using an external speaker connected to your radio, please note the following. To make sure radio traffic is also heard in your headset or helmet kit, you must use both the CJ-SPK-DC and SPLITTER-MONO-3.5. Together, these will disable the radio speaker while passing the signal to both the external speaker and into your intercom. (not compatible with Rugged Radios RDM-DB).