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Product details can be found under Specifications on the product information pages for each product. The RS120 model is smaller than the HDR120. All other specifications and warranty are the same. I hope this helps.
Sorry, there was a problem. Please try again later.The difference is that the HDR-120 are HiFi headphones (high fidelity). Better sound quality. I think that the RS-120 have been discontinued, although you may be able to buy them in some places .
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