100% Original , No Box , Denon High Class IEM . High Res Audio With Denon Eartips S/M/L ,Bonus Eartips , Case COMPACT, LIGHTWEIGHT EARPHONES MADE WITH PREMIUM TECHNOLOGY – Housed in die-cast aluminum and resin body, these headphones are equipped with an 11.5mm driver and Denon's Acoustic Optimizer Technology that delivers dynamic and distortion-free sound SO COMFORTABLE, THEY CAN BE WORN AT ALL TIMES – Ergonomic design with a secure fit in the ear A GREAT TRAVEL COMPANION – Whether you are relaxing at work or travelling far and wide, listen to soulful music without compromising on sound quality. These headphones are designed with advanced technologies, delivering the best possible audio on the go VIBRATION-REDUCING CABLE – Covered in fiber-mesh for extra durability and longevity, the cable is specially designed with a Radial Cascade Damper system that reduces noises, interferences and vibrations transmitted through the cable, while on the move Specifications -Impedance – 16 ohm. -Sensitivity – 110 dB/mW. -Maximum power input – 250 mW. -Frequency response – 5-40,000 (Hz). -Weight – 8.6 g (not including cable).