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Watch-style sleep aid - deep sleep speed up - the secret to falling asleep quickly at night/ Healthy sleep aid black technology, increase sleep time, improve sleep quality/ Single physical effect/no dependence/falling asleep in a short period of time/safe to use/high quality sleep/portable and portable/ Easy to use: The design with a display makes it easier to adjust the gear that suits you through buttons Portable: This sleep machine is small and easy to carry, and it uses USB charging and can be used at any time