Perfect for any noisy environment but in particular sports events, music concerts / festivals, aircraft noise, vacuum noise, garden power tool noise, shopping centres.Function: passive noise reduction.SNR: 33 dB.NNR: 27 dB.Wearing method: head-mounted.Lining material: foam.Product features: the adjustable headband made of non-metallic material is suitable for different types of rotating cup and more comfortable to wear.Suggestion: wipe and clean the outside of the earmuffs. It is better to wear them with the earplugs.Adjustable activity area, can adjust the size of the earmuffs according to personal needs to ensure the comfort of the headband.Electrically insulated headband, double headband design, helps reduce heat accumulation while providing good balance for more comfortable wear.Use: concentrate, protect hearing is your home, dormitory, self-study classroom, travel , factory, construction site downtown and other places from noise interference of good helper, is your healthy life of good partner.The side movable interface of earmuffs can be rotated to adjust the Angle of earmuffs according to different face types.Frosted fiber headband, pressure diffusion technology, artificial design of the headband, using frosted special fiber production, wear simple fashion, long use.High quality sound-absorbing cotton. The interior of the ear army is filled with high-quality sound-absorbing cotton. The dense gap of sound-absorbing cotton can greatly reduce the sound passing through.Aftermarket: All products are inspected before shipment, if you have a problem with the product, please do not hesitate to contact us.Packing list: a pair of soundproof earmuffs.Ear muffs are widely used in classroom and library to muffle the annoyed noise such as whispering to help primary school students focus more on studying and reading.The delivery period is 15~25 working days. If our products are not satisfac