Black bone conduction headphones, AEROPEX. Includes charging cable, operation confirmed. - Color: Black - Accessories: Charging cable, sports belt - Design: Bone conduction design - Shape: Neckband type Please check the condition of the product in the images. 【Reason for being a "defective" item】 1. When you shake the left and right speaker parts, there is a rattling sound. This is a common issue with this model, and it's likely that internal parts have shifted. However, the rattling sound is not very noticeable when worn and moving, but it may be noticeable during intense exercise or running. You can use it without any problems for listening to music normally, but I will sell it as a defective item at a reduced price. Series...Aeropex