Let us introduce you to Coloud, the new name in music. Coloud is based on collaborations with the strongest names and symbols in entertainment and merchandizing. We turn brands into sound. Our cords transfer visual life from any music player you choose to plug into. We are in the business of creating function, value, design and quality. We make headphones that endure, enrich and extend your lifelong music experience. A headphone sounds. Coloud makes it show, and more. A Coloud headphone is recognized through its fine-tuned ergonomics, design, graphics and the triangular plug. The plug is our sign of approval saying this products holds high ambitions in quality and style. The C19M model is a thoroughly tested model proven to work fantastically. It"s an in-ear headphone with a neutral sound and a custom fit. The C19 comes with S, M and L replacement silicone caps for a custom fit,. Model: C19 Driver Unit: 9 mm Handmade Drivers Frequency Range:20.0 Hz~20.0 KHz Impedance: 16 ohms 1KHz Sensitivity:107 dB Max Input Power span: 5 mW Plug:3.5 mm Microphone type: Unidirectional electret Size: S,M,L silicone ear caps Premium replacement warranty: 1 year