Feature: 1. With better noise reduction and the sound heard through internal amplifiers is very natural and clear. 2. Ergonomic headband with soft padding reduces the pressure on your head for superior comfort. 3. Compact folding design for easy storage and convenient to put in a range bag, backpack or briefcase while take only a small space. 4. External audio jacks allow the earmuffs to double as stereo headphones when connected to MP3 players or other audio sources. 5. Ideal for shooting, hunting, sports events, woodworking projects and lawn care, extremely suitable for operating heavy machinery. Specification: Item Type: NoiseReduction EarMuffs Material: ABS Battery: 2 x AAA Batteries(Not Included) Use: For shooting, hunting, sports events, studying, woodworking projects and lawn care, extremely suitable for operating heavy machinery or landscaping business. Package List: 1 x NoiseReduction Earmuff, 1 xConnecting Line 1 x Instruction.