... CE,ROHS,FCC Technical Data:Speaker Dia: 9mmSensitivity: 108dB S. P. L at 1KHzImpedance: 32ohmRequency Response: 20--20KHzMax. Power: 15mWPlug: 3 ... / earbuds, headphone and multimedia headphone. including various computer headphones, MP3/MP4 player earphones, earplugs, wireless headphones, and more use. promotional mp3 headphones