【UPGRADED DUAL MAGNETIC CIRCUIT DYNAMIC DRIVER】 - KZ EDX-Ultra in ear headphones are based on the evolution of the KZ EDX pro. The KZ team has carefully developed a new 10mm dual magnetic circuit dynamic driver for the KZ EDX-Ultra. The magnetic flux is improved, making the mid-low frequency sound more clear and smooth. The sound quality is great, it is ideal for guitar, bass, drum. 【RESIN&METAL EMBEDED COVER】 - Imported resin cavity with bright metal fittings, Using resin inlay technology, the cavity and the metal cover are closely attached together, showing the excellent texture of KZ EDX-Ultra earphones headphones. 【DETACHABLE CORD 0.7MM 2PINS】 - The improved plug-in structure is compatile for a KZ Bluetooth module and can be upgraded to a Bluetooth headset. You can also replace the KZ upgrade cable to improve the sound quality of the headset. (Adapted Bluetooth wireless modules /upgrade cables need to be purchased separately. 【ERGONOMICALLY DESIGNED】 - After collecting a large amount of human wearing experience data, the radian of the front cavity shell and the inclination angle of the catheter are continuously designed and optimized, which effectively reduces the foreign body sensation of wearing earplugs, and is suitable for long-term wearing and listening. 【HIGH-PURITY SILVER-PLATED WIRE FOR LOSSLESS TRANSMISSION】- Use high-purity silver-plated wire base, the silver-plated wire conductor can reduce the the loss in the transmission of electrical signals can effectively improve the sound transparency, make the sound crystal clear, and the vocals and musical instruments are more beautiful.