The Pioneer SE-MJ31-E Over-the-Ear Headphones are a fully enclosed, dynamic stereo headphone set that offers superior sound. Listen to music or audio books with crisp clarity. These Pioneer Headphones feature a 105dB sensitivity and have a 8Hz to 25kHz of frequency response. These headphones also feature an OFC litz wire 3.9' cord. The SE-MJ31-E LOOP Headphones are an excellent gift for most anyone who listens to music, audio books or other types of audio.