Sennheiser RS 110 II. Ear coupling: supraaural, Wearing style: Head-band, Headphone frequency: 22 - 19500 Hz. Connectivity technology: Wireless, Wireless technology: RF, Wireless range: 100 m. Dimensions (WxDxH): 85 x 110 x 133 mm, Weight: 180 g. Battery technology: Lithium. Package dimensions (WxDxH): 265 x 216 x 138 mm, Package weight: 990 g, Packaging type: Box