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Amazon.com: HQRP Two Rechargeable Batteries Compatible with Sennheiser RS110, RS120, RS130, RS160, RS170, RS 180, RS-195, RS-220, PXC 250-II, PXC 350, PXC 450, HDR 170 Headphones : Electronics
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Sennheiser Black HDR 170 Around-Ear Wireless Stereo Surround Sound Headphone (Charger/Transmitter not included) - Newegg.com
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