These Volume Limited Kids Headphones are ideal for children and anyone concerned for the health of their hearing. Suitable for use with all portable audio devices, the sensitivity has been Limited to reduce the risk of permanent hearing damage that can be caused by continually listening at volumes considered to high. These Headphones fit comfortably over the ear & do not isolate the user from surrounding noise. They are ideal for listing to music through most digital playback devices such as iPod, mp3, portable DVD & CD players. Speaker Dimension : 1 1/5-Inch Sensitivity : 81±3db@1mw 1KHz Impedance : 150ohm Frequency Response : 20Hz - 20kHk Rated Power : 10mw Cable Length : 47.2-Inch Plug : 1/8-Inch (gold plated)