http://tinyurl.com/oyaqbdj<P>Noisebuster Electronic Noise Canceling Safety Earmuffs - Standard - PA4000Product Review<P> Click on the link for more reviews<P>Electronics cancel low frequency noise<P>Comes with sturdy carry case<P>NRR 26dB -- PLUS 20dB electronic noise cancellation<P>Can be used with portable audio<P>Over-the-head and behind-the-head use<P>
