Maybe with perfect line of sight with the base unit. Leave the room and it will start to fade in 30ft.

You must plug it into either your tv or receiver. It then transmits an fm radio signal of the input similar to the Ipod car transmitters. The headphones are actually an fm radio with no presets and a scan button. It has a reset button that causes it to start scanning at one end of the fm radio range until it pics up a signal. If the transmitter is working properly with a full charge, it will connect as the first signal after the reset. The problem is that it uses aaa batteries that drain after just a couple of hours (one movie) and you will have a tough time acquiring a signal with the headset until you replace the batteries. Te headphones do double as a nice little tinny sounding fm headset that should work anywhere you take them and would even tune to your ipod transmitter in the car.

Actually the ear seal is pretty good. Slightly better than the more expensive RCA 900 Wireless Headphones that I recommend purchasing instead of these. I purchased my RCAs at my local walmart after I returned these.

No,
after u hook up the transmitter with the TV, you can change TV to mute, and still be able to hear it in your headphone

Local FM stations are recieved easily. Several in my area. Button on side of headset auto selects strongest stations.

I feel its the lack of external power source. Battery powered only.

Yes
you can use it wirelessly, but not very portable.
or you can connect the headphone direct to you iPod with a cable that came with the headphone, but you still need 2 AAA battery in the headphone

Yes i think that would work. However, each earphone must be tuned to the transmitter and not a radio broadcast.

well since you only can connect it via USB, it's the same amperage as a usb port.

They don't get any smaller they are fairly big the only downfall although there comfortable they don't really fold.