Recommend the initial use back back good 2-4 hours from start to adapt to gradually extend the wear of time, from a security point of view should not be worn during sleep to use.
建议初次使用背背佳从2 - 4小时开始，适应后逐渐延长佩戴时间，从安全角度考虑睡眠时不宜佩戴使用。
Recommend the initial use back back good 2-4 hours from start to adapt to gradually extend the wear of time, from a security point of view should not be worn during sleep to use.
建议初次使用背背佳从2 - 4小时开始，适应后逐渐延长佩戴时间，从安全角度考虑睡眠时不宜佩戴使用。
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