C2 bone conduction headphones with Bluetooth 5.0, equipped with ENC for running and fitness. - Model Name: C2 - Brand: YEAHYO - Features: Bone conduction headphones - Bluetooth Version: Bluetooth 5.0 - Noise Canceling Function: ENC equipped - Intended Use: Running, walking, fitness - Color: Black I purchased these this month and they arrived, but they didn't fit because my ears are too small. I took them out of the box once to try them on, but I put them back in the box immediately afterwards, so they are practically new. Thank you for looking.