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Best Buy: Sennheiser HDR 170 (Additional KLEER Wireless Headphones- Requires the RS170) Black HDR170
HDR180 Digital Wireless Headphone System (RS170/180) User Manual RS170_US Sennheiser Electronic (NY)
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Compare Sennheiser RS 170 vs. RS 180 vs. Sony MDR-DS6500 | Review of Sennheiser RS 180 Digital Wireless Headphone System (110 dB) with automatic modulation and balance control (Electronics) | Tgreer
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