Electronic Ear Muffs, Earmuff Style Over-the-Head, Noise Reduction Rating 22 dB, Dielectric No, Radio Band Type AM/FM, Connection Type Wired, Cushion Material Polyester, PVC, Battery Size AA, Cup Color Green, Auxiliary Input 3.5mm Jack, Includes 120V Charger, Series QUIETUNES(TM), Standards ANSI S3.19-1974, Band Color Black, Band Material PVC, Battery Chemistry NiMH, Features Automatic 4 hr Shut Off, Number of Batteries 2, Battery Type Rechargeable