audio-technica SONICFUEL sealed on-ear headphones Portable Black ATH-AX3 BK Playback frequency: 10~24000Hz. Maximum input: 1000mW. Impedance: 55. Output sound pressure level (sensitivity): 104dB. Driver diameter: 40mm. Plug: 3.5mm. Code: 1.2m (Y type). Weight: about 140g (except code). Accessories: Porch. You can listen to the mid-high range sound clear and powerful bass by new design 40mm driver.