|  |  | Sennheiser RS-130 Wireless HiFi RF Headphones, Dynamic, opened Transducer Principle, 18-21000Hz Frequency Response (RS130 RS 130 RS130): approx. 275g Weight Wo Cable, at 1 kHz 104 dBCharacteristic Spl, Circumaural Ear Coupling, <: 0.5% Distortion, 2.4 V – 3 V via 2 AAA size NiMH batteries (LR 03) Power Supply, headphone batteries last for approx. 22 hOperating Time.
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