Function: Large Comfort and protection effect AFC technology design new technology to improve the solid metal ring headband structure, the top of the head band outside fine canvas cloth, inside, leather wear-resistant, according to the size of the face adjustment length. Suitable for special and high requirement environment. Advantages: soft and comfortable, with sponge headband inside, more comfortable and durable metal ring headband structure, air Control Technology that stands the test of high environmental requirements (an introduction to air control technology is given below) provides excellent sound attenuation effect unit type earmuffs for quick and easy replacement, multiple Sound attenuation value optional Headband l2 reduces noise by 29 DB. Soft and comfortable, the headband with the sponge inside is more comfortable to wear for a long time, the height can be adjusted and retractable at the same time ensure that the headband can be fixed well when used, the headband can be durable and twisted without any problem. Adjustable headband, according to the size of the face adjustment length, men and women wear are suitable. MATERIAL: Headband inside, leather wear-resistant, inside the soft and comfortable sponge. Earmuffs from outside to inside once is: Plastic Shell, sound-proof material, sound-absorbing Sponge, soft round pad of CORTEX auricle. Weight: Only 260g volume decibel compared to 130DB, jet take-off Sound 110DB, propeller take-off Sound 105DB, permanent hearing loss 100DB, pneumatic drill sound 90db, noisy bar ambient sound 85db or less, ? Does not destroy cochlear hair cells 80 decibels, noisy offices 75 decibels, human ear comfort limit 70 decibels, street ambient sound 50 decibels, normal conversation sound 20 decibels, whispering. ? DB is the sound pressure level unit recorded as DB. Used to indicate the size of a sound. One Decibel is about the sound one is just beginning to feel. Suitable living environment should not exceed 45 DB, should not be lower than 15 DB. According to ordinary people's hearing: 0-20 db very quiet, almost can not feel. 20-40 decibels, quiet as a whisper. 40-60 decibels general, ordinary indoor conversation 60-70 decibels noisy, nerve damage. 70-90 decibels loud, nerve cell damage. 90-100 decibels, increased noise, hearing loss. 100-120 decibels unbearable, stay a minute temporarily deaf
