Specification : Lightweight body Natural Sound Flex sleeve Fashion Stereo Headphone ,Idea for portable CD,MD & MP3/4 In-Ear noise isolation Frequency response:20-20000Hz Impedance:160 ohm 15% 1000 Hz/Mw Sound pressure level:95dB(at 1000HZTMW) Shipment detail: 44x30x26cm 100PCS/CTN , 15kg