Sennheiser RS 120 II. Ear coupling: supraaural, Wearing style: Head-band, Headphone frequency: 22 - 19500 Hz. Connectivity technology: Wireless, Wireless range: 100 m, Connector(s): 3.5mm/6.3mm. Dimensions (WxDxH): 85 x 225 x 133 mm, Weight: 0.23 kg, Receiver weight: 0.2 kg. Battery life (max): 20 h, Battery technology: Nickel–Metal Hydride (NiMH), Battery type: AAA. Cables included: AV