The Calus XG300 (often associated with the Sony SRS-XG300) is a powerful, portable Bluetooth speaker known for its "Super Bass," featuring dual drivers, passive radiators for punchy bass, and customizable RGB lighting synced to music, all housed in a rugged, IP67 waterproof/dustproof design with a retractable handle for easy transport. Key features include up to 24-25 hours of battery, fast USB-C charging, Bluetooth 5.0, hands-free calling, and connectivity via the Sony Music Center app for sound modes like MEGA BASS, LIVE SOUND, and Party Connect for multi-speaker sync.