Opus Features:

Weighing just .5 oz ( 15 g) the Opus™ are half the weight of most in-ear headphones. Hypo-allergenic easy to clean soft silicone gel ear buds, molding itself to the exact contour of the ear canal. No need for ear kits, adaptors and add-on foam inserts. Sound Isolating earpiece design that suppresses environmental noise without relying on cumbersome speaker enclosures. Enjoy your favorite music at lower volumes. High Performance Neodymium magnet drivers for excellent frequency response (20-20,000 Hz), balanced and powerful bass response, with a sensitivity rating perfectly matching the iPod audio specs (96dB @ 1KHz). High fidelity, studio quality copper cables designed with minimal audio loss and maximum durability in mind. Smart sliding crossover ring, ensures maximum comfort and easy storage. Flexible reinforcements at the earphone and plug. Straight pin 3.5 mm 24 k gold plated connector for outstanding audio quality and durability. Works With all audio devices, i.e. Mp3 players, CD players, etc.