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Brand Description: Solar power function that does not emit unnecessary batteries, has been certified as an "Eco-Mark Product" (Environmental Conservation Item) by the Japan Environment Association of Foundation as a product to protect the planet.
Solar power function eliminates the need for regular battery replacement, making it eco-friendly and economical for long term use. You can match it with a pair and it is also recommended as a gift.
The belt is also a free adjustment type that allows you to easily adjust the size.