The RF wireless open-back Sennheiser RS 120 headphones are available in “Used – Very Good” condition for around $29 by Amazon Warehouse Deals actual, so you get free 2-day shipping if you are a Prime member.

There are two potential deal killers for these headphones according to the reviews, they lose their connection to the transmitter base if there is short silence (so you get annoying noise), and the mechanics of the AC input are not good.

If you are looking for a better than entry-level RF-wireless pair of headphones and you are comfortable with used, as of the time of writing, there is one listing of the Sennheiser RS 120 in “Used – Good” condition for $35~ by Amazon Warehouse Deals (AWD) by AWD actual, so it is eligible for free 2-day Prime shipping. These headphones have been around for a while, they average 4.1 out of 5 based on over 10,000 customer reviews.

This is RF wireless, not bluetooth. They are not using the Kleer protocol. That’s higher up the RS1x0 line-up. The latest generation of the RS series does not appear to be using Kleer technology (perhaps licensing fees and such).

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The Sennheiser RS 195 RF Wireless headphone system (one pair of headphones, one transmitter base) goes for $450 in new condition at authorized dealers but if you want to save some, you can get it in “Used – Good” condition for $316 (was $337) by Amazon Warehouse Deals. They also have a couple of listings in “Used – Very Good” condition for $360.

The Sennheiser HDR 120 headphones (the headphones part of the RS120 wireless system which can support up to four HDR 120s) are available in “Used – Acceptable” condition for around $36 by Amazon Warehouse Deals. As usual with used items, both prices and supplies change often.

If you are curious about the new RF-wireless Sennheiser headphones but don’t want to pay full price, the RF 195 is available in “Used – Very Good” condition for $352 by Amazon Warehouse Deals. The new condition goes for $450 at authorized dealers. These are closed back, over-ears, with manual controls (balance, volume). The RS models include both a pair of headphones and a transmitter base.

The HDR 175 headphones, that are the headphone part of the brand new Sennheiser RS 175 headphone system are currently available in “Used – Like New” condition (original damaged packaging) for $130 with free shipping by Amazon Warehouse Deals. They go for $170 in new condition at authorized dealers. This of interest if you need additional headsets for the RS 175 system that goes for $280 in new condition.

If you are not familiar with the Sennheiser wireless headphone naming scheme, the RS models are headphones + transmitter base. The HDR are the headphones only, no transmitter base. The new RS175 averages 4.7 out of 5 based on 15 customer reviews and has the same number of questions answered. Both reviews and answers are searchable separately, you just have to page down on the various sub-pages to look for their dedicated search boxes.

The new condition price of the recently released Sennheiser RS 195 RF wireless headphones is $450 at authorized dealers, but if you want to save some and not wait for future discounts, they are currently available in “Used – Very Good” condition (damaged packaging, missing battery) for $365~ by Amazon Warehouse Deals. Keep in mind, the battery is missing from this particular offer. These are closed-back, over-ears, with a charging dock which also serves as a stand.