POWERFUL BASS RADIATOR: The back of the W-KING D9-1 loud Bluetooth speaker has a unique 7.2'' large passive radiator design that delivers deep, resonant bass through its 2x35W peak subwoofers and 2x15W peak tweeters for balanced, dynamic sound. ADVANCED CONNECTIVITY: Equipped with Bluetooth 5.0 technology offering 100ft range, plus versatile connection options including AUX input, TF card slot, and NFC pairing capability for Android devices. Supports hands-free calling functionality. EXTENDED BATTERY LIFE: Enjoy up to 40 hours of playback at lower volumes on a single charge, with a built-in USB-A port for charging your smart devices. The ergonomic handle design ensures easy portability for outdoor adventures. DUAL SPEAKER PAIRING: Connect two D9-1 speakers together for an enhanced 120W stereo sound experience, perfect for larger gatherings and outdoor events. Please use a 5V 2A power adapter(not included) for charging. The portable bluetooth speaker makes the warmest gift for b