Elecom Earphone S210. Ear coupling: intraaural, Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 97 dB. Connectivity technology: Wired, Cable length: 1.2 m. Package dimensions (WxDxH): 70 x 70 x 155 mm, Package weight: 80 g. Maximum input power: 0.06 W