Electronic Ear Muffs, Earmuff Style Over-the-Head, Earmuff Type Rigid, Noise Reduction Rating 25 dB, Dielectric No, Radio Band Type No Radio Band, Intrinsically Safe No, Connection Type 3.5 mm Stereo, Wired Connection Type 3.5 mm Stereo Jack, Cushion Material Polypropylene, PVC, Cup Color Black, Auxiliary Input 3.5 mm Jack, Includes 3.5 mm Cable, Series Sync (R), Standards ANSI S 3.19 -1974, Band Color Black, Band Material PVC, Cable Style Straight, Features Limits Audio to Safe 82 dB