We particularly chose an upgraded balanced armature unit for this in-ear headphone. The 30017s BA is mainly used for high frequency, the 31736s is used for mid and high frequency, and the 29689s is used for intermediate frequency. We use high-precision digital modeling and 3D printing of the acoustic internal support to avoid mutual interference of 10 balanced armature belts and reduce the cavity resonance effect. It is made up of 10BA and three-channel duct to display pure sound quality. Professional front-end, high quality sound source, better sound effect. The combination of aluminum alloy and resin presents a sense of beauty. The surface is polished by hand to create a metal mask that is wear-resistant, smooth and skin-friendly. both exquisite luxury and crystalline effects. Equipped with a detachable silver-plated wire to improve transparency, separation, sound field, etc., and effectively reduce signal loss. Connection method: wired Headphone type: in-ear Plug type: 3.5mm Pin type: 0.75mm 2 PIN Sensitivity: 105dB Impedance: 18 Frequency range: 10Hz-40kHz Cable length: 1255cm Product weight: 32 3g Speaker type: 22955s BA*1; 29689s BA*1; 30095BA*1; 31736s BA*2 Detachable cable: yes Microphone: yes