Elecom Sundries Gum. Ear coupling: intraaural, Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 100 dB. Connectivity technology: Wired, Cable length: 1.1 m. Dimensions (WxDxH): 12 x 19.5 x 22 mm, Weight: 3 g. Package dimensions (WxDxH): 33 x 33 x 167 mm, Package weight: 50 g. Maximum input power: 0.1 W