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At&T St30-Blk Sport In-Ear True Wireless Stereo Bluetooth Earbuds With Microphone (Black)AT&T ST30-BLK Sport In-Ear True Wireless Stereo Bluetooth Earbuds with Microphone (Black)&bull 6 mm drivers&bull Frequency response: 20 Hz to 24 kHz&bull Bluetooth 50 with TWS (True Wireless Stereo) compatibility means the earbuds can be used separately--2 list..