I've only used it a handful of times, less than 20 hours, because I have migraines and can't tolerate the device. This is the reason for selling. It's new, and it comes with a strap I bought and installed on it, which is more comfortable than the original strap🙏🏻 It also comes with a battery charger. I bought the strap and charger, and the total cost was about 1800. I'm selling it for 1100, negotiable.