Audio-Technica Portable Headphone Navy ATH-UN1 NV Type: Sealed dynamic type. Driver: 28mm. Output sound pressure level: 97dB /mW. Playback frequency band: 20 ~ 27,000Hz. Maximum input: 500mW. Impedance: 32. Plug: 3.5mm gold-plated stereo mini (L type). Code: 1.2m. Ear pads, headband, ear cup is made of ultra suede (artificial leather). provide ultra-light comfort.