Protect from most low-to-medium hazardous noise levels while maintaining high-fidelity sound qualities
Volume limiter technology manages output volume
Use with most MP3 players, mobile phones and other personal audio devices at work or at home
Sleek design with comfortable fit
No batteries required
Material(s): Metal/Plastic; Ear Cushion Material: Foam; Noise Reduction Rate (NRR): 25 dB; For Use With: MP3 Players, Mobile Phones, Personal Audio Devices.