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About this item Efficacy: This sleep aid device can relieve anxiety, improve insomnia, and help you sleep Easy to use: The design with a display makes it easier to adjust the gear that suits you through buttons Occasion: It can be used at home, in the office, on business trips, or traveling Design: The strap design can prevent the sleep device from falling off during sleep Portable: This sleep machine is small and easy to carry, and it uses USB charging and can be used at any time