ATech - JBL PartyBox 300 Portable Bluetooth party speaker with light effects JBL Signature Sound Enjoy an immersive audio experience at home or at a party that only JBL sound can provide.
Partybox 300 software version 341742 - YouTube
JBL Party Box 200 ,Party Box 300 Ver.1.3 Speaker System Service Manual PDF (SBTJBL4580)
JBL Partybox 300 Firmware Upgrade from 341219 to 381122103 184650 - YouTube
JBL PARTYBOX 300 - NEW FIRMWARE (381221) | SOUND TEST | 100% VOLUME 😱 - YouTube