9D Surround Neck Speaker Latest Design. Latest version neckband speaker, 4 drivers, 9D sound effect, hifi audio decode: MP3, WMA, WAV, FLC, APE, multipoint connection, support bluetooth 5.0/handsfree call, CVC 8.0 noise reduction, with flexible neckband. Built-in 2x380mah battery for 10 hours working. Size: 20x18x3cm, weight: 80g. Color: black/gray.