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: Noise Reduction Ear Muffs 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 Noise Reduction Earmuff 1 x Connecting Line 1 x Instruction How to use: 1. Stretch the headband to its full size, place it on your head and make the earmuffs cover your ears. 2. Adjust the size of the headband and the height of the earmuffs until the headband supports the earmuffs and the ears feel comfortable. 3. The cushion of the earmuffs should fit tightly to the head. 4. Adjust the headband to ensure the correct tightness and effectively isolate the noise.