Flat4 Sui Plus ◎ Specs Elements: 010e002 Copper-plated plate & yoke adopted, Φ10mm dynamic type x 2 (per channel) Acoustic method: Twin Equalized Element method Output sound pressure level: 104dBSPL/mW Frequency response: 3.5～45kHz (Hi-Res compatible) Maximum input: 400mW Impedance: 18Ω Weight: Approximately 17g Plug: Φ3.5mm gold-plated stereo mini plug Cord length: 1.2m (Y-type) Slight scratches on the main unit No dirt or damage No sound quality issues No disconnection Accessories SONY cloth case included Also listed on other sites.