The Muse S 3 Athena Carbon Black EEG Meditation/Sleep Tracking Headband is an electronic monitor designed to track and analyse brain activity during meditation or sleep. It features Bluetooth connectivity and comes with a rechargeable battery for convenience. The sleek black design includes the headband, charging cable, and a carrying case for easy storage. Made by Muse, a trusted brand in brain monitoring technology, this product is perfect for those looking to improve their mental well-being and sleep quality.