Smart NFC Bluetooth speaker stereo subwoofer 1: Wireless Bluetooth 3D speakers exclusive support two speakers in series while access to a source consisting of 3D stereo sound to stereo 3D surround effect. 2: NFC-enabled phone quickly paired. 3: Using laser engraving technology touch buttons high sensitivity long life waterproof. 4: Adopts quality sound element and advanced diaphragm crisp and pure sound 5: German master tuned sound restore the most authentic voice With quality sound at each band 6: Support TF card Bluetooth 3.5mm AUX multiple connectivity options. 7: Support phone voice calls hands-free.