5.3 x 3.9 x 2 inches

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BONE CONDUCTION FOR OPEN EAR SAFE: Cheekbone conducted sound, plug-free listening to the headphone sound and surrounding sound simultaneously, enjoy music while being aware of surrounding dangers, and keep the ear canal clean.
OPEN-EAR DESIGN SPORTS HEADPHONES: Earbuds-free enjoying the sound of headphones while being aware of the surrounding dangers, ultra-light titanium wrap-around frame fit on the ear, suitable for long-time wear.