Used Sennheiser RS120 Wireless (RF) for $35

The Sennheiser RS120 wireless (RF) headphone system (one base/transmitter and one headset) goes for $52 in new condition, but if you want to save some more, it goes for around $35 in “Used – Good” condition by Amazon Warehouse Deals. The headset can only be used with the included transmitter. You cannot use them like normal headphones with a 3.5mm input. This model does not use Kleer technology.