Purchased from e-earphone. Functionality has been confirmed. As you'll find if you research this product, its original specifications include weak Bluetooth connectivity and microphone sensitivity. I'm selling it because this was bothersome from the time of purchase. During functionality checks, I played about 30 songs in a row, each 3-5 minutes long, and the connection didn't drop. However, in my previous use, the connection would occasionally cut out. Please purchase only if you understand these product specifications. As proof of authenticity, I've included images showing the product being recognized without issue in the BOSE app. Please take a look. This is a used item, so there are scratches and stains. It's a very good product for listening to music in a calm environment, and the powerful bass typical of BOSE is also great. The ability to talk to others while listening to music is also a very high point, so if you can make good use of it, please consider it. In addition to the original box, I'm including a wooden case, but the wooden case has cracks due to expansion and contraction.