Construction seems way better than other headphones Ive had in the past at this price, and theyre really light (which is important if you plan on having them on your head for long periods of time). At the side of the box, there is a small metal piece with a unique ID and a code above it. It worth every $ I have spend on it. Really happy with this purchase! Preis und Produkt entsprach absolut den Erwartungen . The mic sounds great during phone calls. I have used it for 2 days now and have no issues or complaints to be honest. Ich bestellte die Schuhe also in der selben Größe wie meine alten Schuhe. Since she has watch, phone and AirPods, so I decided to buy this one. Compared to other cheap bluetooth headphones Ive tried, including a pair of cheap bone conduction headphones that broke after 6 months, theyre much more comfortable.