Adopt a custom liquid metal diaphragm 9.2 mm moving ring (DD) full-range structure.Uni-Q coaxial sound transmission design. 

Prevent the interference of stethoscope effect. 

The unique equalization circuit (EEC) design makes this pair of earphones a bright spot of innovation in the industry.  

Precision 3D printed cavity and handmade panel.  Ranko Acoustics engineers did many contrast adjustment.  

Eventually created the RIE-880 the perfect combination of comfort, ergonomic design, unique color matching,

ultra-wide band sound field,powerful, transparent and clear.