High Sierra Noise Cancellation Headphones can keep you focused in style. The High Sierra Noise Cancellation Headphones are the premier promotional headphones. The Leeds 1660-54 features noise level reduction 12 decibels at 300 hz, sensitivity 106 db/3 db at 1 khz. The High Sierra Noise Cancellation Headphones has two padded earpieces and a 70" cable plugs into plane seats, MP3 players, iPods, and computers. The High Sierra Noise Cancellation Headphones include the High Sierra travel pouch.