iRiver IDP-550 Earphones for MP3， iPod， iPhone

Dynamic Sound 

Hight Quality Sound with Dynamic sound maker， Basic Open Type Stereo Earphones

Rated Poewer : 3mW (0.3Vrms)

Max Input Power : 20mW (0.8Vrms) 

Earphone Impedence : 32Ω ± 6.4Ω at 1KHz

Pulg : 3.5mm stereo plug