Hello, welcome to ZJYSM1018, welcome to buy our products, we will be happy to help you.[Charging Type]: USB Charging[Product Function]: 10 Frequency [Product Material]: Silica Gel + ABS[Maximum noise]: 20 decibels[Waterproof or not]: Waterproof[Product weight]: 300g[Size]: 45*138*75 mmThank you for browsing and purchasing our products, we look forward to your visit again, and hope that you can recommend our store to people around us, our delivery time is 15-20 working days, due to the special nature of the product, use No refund will be given. If you have any questions, please contact us and we will provide you with quality customer service as soon as possible.
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