Features:Lightweight soft on-ear cushioned headphones are perfect in any setting. They keep the noise out and the music in.Unit��o|��40mm (1.57in)Frequency: 20-20KHZsensitivity: 108dB ?�� 2dBresistance��o32|??��15%plug: USBmaximum input power : 100mW package included:1 pcs earphone