Works well. Covers a full 9 hours of sleep ...

Works well. Covers a full 9 hours of sleep. Few things you should know; You have to remember to remove the battery pack from the headphones and plug it into a wall charger. Then, when you're ready to use them again, you unplug the battery pack, plug the battery pack into the headphones, then setup the Bluetooth connection. Also, I use an adjustable sleep mask over these to block out the light and keep them in place. I got these because my phone doesn't have a built-in headphone jack.

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