The HD381 series headphones feature a comfortable, personalized fit with superior noise isolation and offer 3 distinctive sound profiles, each with its own character: The HD381 features a rich bass and boosted low end; the HD381F has a flat extended frequency response suitable for most kinds of music and delivers a sweet vocal sound; the HD381B has a crystal-clear sound quality that faithfully reproduces every detail, while also providing a deep and tight bass.

As for the sound image presented by these headphones, the HD381 gives you the feeling of actually being on stage with the artists while the HD381F makes you feel as if you sitting on the front row and the HD381B puts you in the middle of the concert hall, enjoying a detailed, rich sound. The comfortable ear adapters come in large, medium, and small sizes to fit your ears perfectly. The patented multi-functional cable wrapper/clip wraps the headphone cable neatly or can be clipped on clothes or necktie for added convenience. The HD381 series’ high quality reproduction of the natural sound is ideally suited for personal entertainment and the HD381B also can be used for professional in-ear monitoring. 

Type：Dynamic, In-ear 
Driver：Φ13.5mm, neodymium 
Sensitivity：103dB SPL (1mW) 
Frequency Response：20-20,000Hz
Max. Input Power: 50 mW
Rated Impedance：16Ω (copper-coated aluminum wire)
Cable: 0.6-meter (2 ft.)
Connectors: Gold plated stereo mini plug
Net Weight (without cable): 12 g (0.42 oz)