HAKII Audio provide audio and sports products.
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This is the user manual for HAKII Wind II Bluetooth Cycling Headphones. https://www.hakii.com/pages/hakii-wind-ii-bluetooth-cycling-glasses-manual
This is the user manual for HAKII MIXV Smart Bluetooth Visor Headphones . Online version https://www.hakii.com/pages/hakii-mixv-smart-bluetooth-visor-headphones-manual