The most comfortable Bluetooth® sleep mask in existence * Razor-thin Bluetooth® headphones * Perforated materials for airflow & ventilation * 20 hour battery life (2x leading competition) * Convenient tabs for easy speaker adjustment * No audible battery notifications for peaceful sleep * True 100% blackout with zero eye pressure * C-shaped eye cups for side-sleep comfort Includes Manta SOUND Sleep Mask and mesh bag. Manta Sleep Mask SOUND gives you complete control over the two senses that have the biggest impact on your sleep: sight and sound. Designed for side sleep comfort, the razor-thin Bluetooth® headphones are nestled within a ventilated strap — while the C-shaped eye cups ensure zero eye pressure and a perfect blackout seal without bulk. The result: unmatched comfort as you listen to the sounds that soothe you — so you get the best sleep you’re capable of.