Extra Bass: Enjoy deep, punchy sound wherever you like with your EXTRA BASS speaker. Dustproof, waterproof and washable: With an IP67 ratings, you can take your speaker to the beach, the SRS-XB33 will keep on playing Long battery life: Up to 24 hours of battery life means the SRS-XB33 can party even longer than you can. Even in EXTRA BASS mode, you can party for up to 14 hours. Built-In Mic: The mic function offers a convenient way to talk hands-free, whether it’s a conference call for work or a chat with friends. Party Connect: Enjoy the same song, multiplied, with Party Connect. Connect up to 100 compatible wireless speakers with BLUETOOTH technology