Headphones help protect hearing by blocking out external noise while providing isolated stereo sound for music input or other audio entertainment</br>Device is compatible with a smartphone?? MP3??  iPod or any device with a 3.5 mm stereo audio jack (Audio device is not included with the purchase of this system)</br>System includes two in-ear noise isolating tri-flange ear tip options for a stable?? comfortable fit and isolation of audio input</br>Convenient?? easy-access volume control allows adjusting the audio signal on the move</br>Audio muting option is capable of shutting off sound with just a touch of a button</br></br>Product Description</br></br>Item: Electronic Earplugs?? Ear Muff Style: In-Ear?? Noise Reduction Rating NRR: 26dB?? Series: E-A-Rbud?? Ear Plug Color: Gray?? Battery Type: (1) AA?? Includes: one pair of the UltraFit(TM) Communication Eartips (NRR 20dB) and one pair of the Skull Screws(TM) Communication Eartips (NRR 29dB)</br><br/>http://www.amazon.com/gp/product/B00AEY4QP2