The Hidizs Mermaid MS3 is a hybrid triple-driver in-ear monitor (IEM) that combines a 10.2mm dynamic driver with dual magnetic circuits and dual cavities, and two balanced armatures from Knowles. The dynamic driver uses a bio-nanofiber composite diaphragm to enhance transient performance and energy conversion efficiency. The MS3 features interchangeable pneumatic tuning filters that allow users to customize the sound signature according to their preferences. The IEM is housed in an aviation-grade aluminum alloy shell that is CNC machined for ergonomic comfort and durability. With an effective frequency response range of 20Hz to 40kHz, the MS3 is designed to deliver high-resolution sound and precise audio reproduction. The included cable utilizes 192 ultra-small oxygen-free copper wires, increasing signal clarity and transmission quality. Additionally, users can choose between a 3.5mm single-ended or a 4.4mm balanced cable upon purchase. The thoughtfully designed package includes multiple ear tips, tuning filters, and a custom storage bag, making it a versatile option for audio enthusiasts.