Koniycoi Kk-2500 (with Micro SD Player) Headphone Key Specifications<br>Enjoy Music :<br>With The Built In Quality Mp3 Decoding Chip, You Can Enjoy Mp3 Format Music Stored In The Mini Memory Card , And Wireless Music Enjoyment Is Much More Wonderful. The Built In FM Streo Radio Can Store 20 Channels Program Enriching Your Enjoyment.<br><br><br>Use Connector :<br>Plug One End Of The Accessory Cable Info Into Audio Input Interface Of The Earphone , ANd Connect The Other End Withthe 3.5mm Earphone Jack Of The PC. Thus, YTou Will Get An Earphone With Excellent Perfomance.<br><br>Acoustics :<br>Speaker Diameter : 40mm<br>Speaker Impedance : 32ohm<br>Speaker Sensibility : 108db+/-3db<br>Frequency Response : 20-20 000Hz<br><br>Radio :<br>Frequency Range : 87-108 MHz<br><br>Good Quality, Bass &amp; Stereo