GENUINE and ORIGINAL Packing same as PicturesnTo achieve a sound full of powerful ultra-small body , new development φ5.7mm driver installed .nI adopt the 1.2mU type code that does not get in the way the code .nIt is attached with an earpiece / convenient cord take-up holder of 4 size to choose .nGENUINE and ORIGINAL Packing same as Pictures. Provide Tracking Number To achieve a sound full of powerful ultra-small body , new development φ5.7mm driver installed . It is equipped with high-performance φ5.7mm strong magnetic force magnet driver of the new development , powerful playback of more things than you can enjoy while feeling of size , such as balanced armature type . Fit and stable " NLS ( next loop support structure ) " in the new structure . The evolution " LOOP SUPPORT ( loop support ) " the mechanism of our own . I adopt a ring-shaped circle anew , I realized the design with the originality and solid coupled with ultra-compact body fit . I adopt the 1.2mU type code that does not get in the way the code . I adopt a U- type code that can turn the code on the back of the neck . For example, able to put over from the neck , you can use it conveniently when not in use the headphones . It is attached with an earpiece / convenient cord take-up holder of 4 size to choose . Model dynamic Driver φ5.7mm Output sound pressure level 103dB/mW 10 ~ 25,000 Hz frequency band playing 200mW maximum input Impedance 16Ω ( The code is excluded ) about 3.7g mass Φ3.5mm plug gold-plated stereo mini (L -type ) Code 1.2m (U type )