You may need it Material: Silicone Charge: USB Charge Waterproof: 100% Usage method:1. (1~5) days, 5 minutes a day, up to 2 times a day2. (6~10) days, 8 minutes a day, up to 2 times a day3. (11~15) days, 12 minutes a day, up to 2 times a day4. (16~20) days, 16 minutes a day, up to 2 times a day5. (21~25) days, 20 minutes a day, up to 2 times a day
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