Haylou headphones - gt1
✓ weight: each earphone weighs 4 grams, set with box 30 grams
✓ stem: 7.2 mm driver
✓ autonomy: 4 hours at medium volume, about 12-14 hours with the 300 mah in the box
✓ battery charging time: just under 2 hours
✓ frequency range: 20 hz - 20 khz
✓ connectivity: bluetooth 5.0, hands-free microphone, micro usb connection (charge only)
✓ technologies: passive noise cancellation, a2dp, avrcp, hsp, hfp
✓ others: ipx5 water resistance, aac codec