Summary: Purchased the IS410, this unit definitely needs line of sight for good connection. Returned the 410 and purchased the 840 RF. This unit is the ticket. The 840 is good pretty much all over our house. Great unit and happy wife!
Summary: I have a hearing loss and I thought these would do the trick so I don't have to turn up the tv so loud. I wear hearing aids but you still do not catch everything. My hearing aids can not be programed to the 840 S. I read one review that said they were like plug and play out of the box. That's pretty much true. Setup was very easy. I hooked up the unit with the RCA cable provided, It plugs directly into my cable box.
Summary: Works perfectly! Great range, stereo sound and battery life. My elderly mother was using the TV ears but if she moved she lost the sound because they are IR line of sight. The Sennheiser are radio RF and do not need line of sight and they are stereo too!
Summary: I bought the Sennheiser 840 RF because it makes my wife very happy—even though she does not use it. I had a TV Ears which I had been using prior to this purchase and I was not happy with it. Although it is more expensive, the Sennheiser is much better for television viewing than the TV Ears. One thing that is really great is being able to walk into another room and still hear what is happening on the television.