Bluetooth Headphones, BEARTWO Upgraded Foldable Wireless Neckband Headset with Retractable Earbuds, Noise Cancelling Stereo Earphones with Mic for Workout, Running, Driving (with Carry Case) Black Color:Black US patentFeatured RS232 DATA Transfer

US patentFeatured RS232 DATA Transfer port

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dustproof and anti-drop features advantages(Please don't immerse speakers into water long time built-in hook

08 mm H x 8

Bluetooth Headphones, BEARTWO Upgraded Foldable Wireless Neckband Headset with Retractable Earbuds, Noise Cancelling Stereo Earphones with Mic for Workout, Running, Driving (with Carry Case) Black Color:Black US patentFeatured RS232 DATA TransferBluetooth Headphones, BEARTWO Upgraded Foldable Wireless Neckband Headset with Retractable Earbuds, Noise Cancelling Stereo Earphones with Mic for Workout, Running, Driving (with Carry Case) BEARTWO Updrade Bluetooth Headphones SX 990 Upgrade version of the SX 991 Bluetooth Headset, classical black+ fluorescent green more compatible with active modern lifestyle; adjust the function key position to the outside neckband surface, more convenient for