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bluetooth sunglasses communicate with cell phone or compatible MP3 player
talk time is only five hours, less than most
Wireless Headphones
PRO
Wireless headphones are going to let you sit in your living room at any hour and watch your giant TV or listen to your infinite music collection without disturbing anyone else.
You can walk around without a cord pulling at you and can finally feel free.
Cheaper than upgrading your speaker system.
CON
The sound isn't as good.
You have to charge the batteries or replace them.
Possible interference and background noise as byproducts.
Quality is similar to that of a radio broadcast.
May interfere with phones or other wireless devices in the house.
Only for in-home use. Too much headphone listening can lead to ear fatigue.
Technology
Wireless headphones will either operate over a radio signal (RF) (over the 900 Mhz band) or with infra-red technology (IR).
Radio frequencies allow you to travel a couple hundred feet without losing your signal.
Infra-red signals keep you within sight of the transmitter.
Batteries can be rechargeable or replaceable.
Rechargeable batteries have a stand in which the headphones sit. Try to keep them charged.
More cost-effective in the long run.
And better for the environment.
NiCd batteries are no good.
NiMh and Li-Ion are fine.
Replaceable batteries work like any other kind of battery-driven technology.
Dolby headphones provide the best surround sound.
Auto-Tuning means your headphones will receive the clearest signal.
Bluetooth Headphones
Wirelessly connect to your other Bluetooth devices.
They'll connect anything Bluetooth. Play music wirelessly from your MP3 player or computer and then pause it for your phone calls. All without wires!
Totally easy and won't confine you to to your living room.
The Gadgeteer describes the Bluetooth headphone experience.
The buying guide on Bluetooth technology provides the basic information on leading a wireless lifestyle.
Make sure to take into account all of the factors listed in the general headphones article.
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