Hands-Free Calling - You can receive incoming calls through this speaker as it has a built-in microphone which provides clear sound quality. external. Surround Sound Quality - The speaker has a special combination of stereo sound and bass effect which is a distinct sound chamber structure that gives you awesome bass and perfect treble. It also comes with stereo surround sound, so you can watch movies in a movie theater setting. IPX4 Waterproof - 100% waterproof and splashproof speaker, combined with IP67 anti-break technology, the latest IPX4 waterproof rating, the unique product carabiner is suitable for any scene, whether it is a bathroom, beach camping, swimming pool, fishing, cycling, or even diving, don't worry, the highest level of waterproof water system can prevent water from leaking from any angle. Bluetooth Connectivity and Strong Compatibility - The ultra-portable speaker can be connected to any Bluetooth-enabled device. It is compatible with devices such as iPhone, iPod, Android phones, MP3 players and many more. It has strong connectivity for clear and uninterrupted sound. Rechargeable Battery - This speaker has a built-in rechargeable battery that can be charged using a USB cable. The playtime of this speaker is 2-4 hours when fully charged, depending on the volume level at which you play music.