These headphones allow you to listen to a wide variety of audio entertainment devices, while reducing potentially harmful external noise. E-A-R buds headphones are designed to be comfortable, versatile and durable. An easy-to-use volume control with audio limiting technology keeps the sound at or below 82dB. An audio muting option lets you shut off the sound at a touch. Headphones are compatible with the 3.5mm audio jack found on your smartphone, iPod®, MP3 player or most other mobile devices. Unit includes 1 Pair of UltraFit™, NRR 20 dB and 1 Pair of Skull Screws™, NRR 29dB, noise isolating ear tips.