Audio-Technica ATH-DWL550R Additional Digital Wireless Headphones for ATH-DWL550 Only, Black

Size: DWL550R (additional headphones) ATH-DWL550 dedicated digital wireless headphones for additional use / Specifications Transmitter Modulation method: AFH Frequency band used: 2.4GHz band (2.404GHz~2.476GHz) Maximum communication distance: Within 30m in a clear line of sight Input: φ3.5mm stereo mini plug RF output: 8.2mW EIRP Transmission band: 20~20000Hz Power supply: DC5V (use the included AC adapter) Usable time: Continuous communication up to about 12 hours Charging time: About 4 hours Maximum external dimensions (approx.): (width) 95 x (height) 113 x (depth) 119mm Weight: About 170g Headphones Type: Closed dynamic type Driver diameter: φ42mm Playback frequency band: 5~40000Hz Maximum input: - Impedance: - Output sound pressure level (sensitivity): 99dB/mW RF output: 7.9mW EIRP Power supply: DC 3.7V lithium polymer battery (built-in) Plug: - Cord: - Weight: Approx. 257g Accessories: Charging cable / Technical conformity mark certified product (frequency band: 2.4GHz band) Additional headphones for listening to ATH-DWL550 with two headphones