Waterproof and rustproof With an IP67 rating, your speaker can be immersed in water. Thanks to the high quality fabric made exclusively in Japan, there'll be no problem cleaning it. Wireless with BLUETOOTH technology and NFC BLUETOOTH streaming with NFC connectivity makes it simple to stream your party playlist. X-Balanced Speaker Unit enhances sound quality and power Developed by Sony, the X-Balanced Speaker Unit achieves high sound quality and powerful sound pressure for a richer, deeper, more rewarding listening experience. Convenient Hands-free calling The speakerphone function offers a convenient way to talk hands-free, whether it’s a conference call for work or a chat with friends. Deep, resonant sound elevates your favorite music with the XB43 wireless speaker. The newly designed X-Balanced Speaker Unit gives the EXTRA BASS power of the XB43 a crisper, fuller sound.