Age range description: Adult. ZERO:RED houses double dynamic driver configuration, with a diameter of 10mm and the other diameter of 7.8mm, the mature internal magnetic circuit structure co-worked with flexible polyurethane suspension composite LCP liquid crystal dome diaphragm, but it has total different inner configuration between standard ZERO, which makes RED offer a better objective indicators while meeting the needs of R&D. TRUTHEAR not only pursues excellent objective measurements, but also attaches great importance to the optimization and improvement of processing technology; The cavity of ZERO:RED is still a sandwich-like structure (front cavity, decorative panel, and a few drops of glue to fill the seams). Equipped with copper-plated silver cable with thicker diameter of single strand. Deliver outstanding objective indicators. Using a DLP-3D printing cavity, usually reserved for high-end multi-drivers products and custom earphones, and the hand-made glue dropping and capping process. Adopt dual polyurethane suspension composite liquid-crystal dome diaphragm N52 Rubidium magnet double- cavity internal magnetic circuit dynamic driver.