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【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.

[Adequate sound insulation is the most important] Noise countermeasures that are important for sleep and concentration are not complete sound insulation or complete soundproofing, but the most important thing is to have an appropriate volume according to the scene.These high-performance earplugs, certified and recommended by two sleep experts, not only reduce the sound to the optimal level as earplugs for sleep, but also great for when you want to concentrate while studying or working, or when you want to relax, or when listening to live music or casual play.Noise is reduced to an appropriate level even when you are sleeping. [Comfortable to wear for long periods of time] The ear tips are made of soft silicone that is gentle on the skin, making them comfortable to wear from the moment you fall asleep to the moment you wake up.It comes in 4 sizes (SS, S, M, and L), so you can choose the size that suits you, so you won't feel uncomfortable even if you use it for a long time, and you may even forget you're wearing it.Furthermore, it has a high-quality fit shape that is fashionable, so it is a simple designed sleeping product that won't feel pressured even when lying on your side. [Comes with a dedicated case for portability] Earplugs come with a dedicated case with a simple design that is convenient to carry.Because it has a compact design that fits in the palm of your hand, you won't have to worry about storage space even when you are out on a trip or business trip.It also comes with a strap so you can hang it on it inconspicuously, so you can take it out quickly when riding public transportation such as the Shinkansen or airplane. [Washable, Hygienic & Design] Unlike memory foam earplugs, these earplugs are made of silicone, so they can be easily washed by hand.You can always keep it clean by washing it after taking a bath or washing your hands.In terms of design, instead of a colorful design, we have adopted a cool design with a stylish matte feel. It's also recommended for people who have hyperacusis or don't like loud noises and often use earphones to protect their hearing, so it can be used as a gift instead of a sleeping phone, or as a birthday present. [Accessories & Functions & Warranty]《Accessories》●Earplugs - Left and right set　●Ear tip sizes - SS, S, M, L･Dedicated case & strap　●How to use - Written on the inside bottom of the package《Warranty》 A Japanese company is in charge of product planning and sales.Masu.We inspect the products before shipping, but if there is a problem with the product, our Japanese staff will take care of it in good faith. (1) 30-day return and refund guarantee (2) 180-day manufacturer warranty