German UVEX dormitory soundproof ear cups sleep with anti-noise reduction learning sleep student airplane rack drum industry

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Color classification:

k1 + comfortable noise reduction 28 dB (send sleep 3 sets + coupons and then reduce 10 yuan)
k2 balanced sound insulation 32 dB (send sleep 3 sets + coupons and then reduce 10 yuan)
K3 + comfortable noise reduction 33 dB (send sleep 3 sets + coupon and then reduce 10 yuan)
k4 + strong sound insulation 35 dB (send sleep 3 sets + coupons and then reduce 10 yuan)
k2 + Folding Comfort Upgrade 31 dB (Send Sleep 3-Piece Set + Coupon And Then Reduce 10 Yuan)

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Color classification:: k1 + comfort noise reduction 28 decibels (send sleep 3 sets + coupons to reduce 10 yuan) k2 balanced sound insulation 32 decibels (send sleep 3 sets + coupons to reduce 10 yuan) K3 + comfort noise reduction 33 decibels (send sleep 3 sets + coupons to reduce 10 yuan) k4 + strong sound insulation 35 decibels (send sleep 3 sets + coupons to reduce 10 yuan) k2 + folding comfort upgrade 31 decibels (send sleep 3 sets + coupons to reduce 10 yuan)