These are Bluetooth headphones. I've used them a few times, but they don't suit me, so I'm selling them. Please purchase only if you understand that there may be minor scratches due to being stored by a private individual. The manual is not included, so please only purchase if you know how to connect via Bluetooth. Connecting should be easy. The charger is also not included (charges via Type-C). The length of the headphones can be adjusted. They can also be folded for compact storage. Please feel free to ask any questions. I will do my best to answer them.