5.1 x 4 x 1.5 inches

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Ture Bone Conduction headphones:The bone headphones adpot bone conduction technology which transmits the vibrations of the sound through bones directly to the inner ear.Unlike common headphones,after blocking the ear, the sound of the headphoens will be clearer mean it is ture bone conduction.
Open ear Comfort & Safety:Bone conduction bluetooth headphones with open ear design, not in ear more comfortable and keep the inner ear canal clean,allows you to enjoy music while be aware of the sound of your surroundings in time. Perfect for wear it on indoor outdoor sports like running,cycling,walking,workout,travel,working to keep safety.