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Originally Posted by andygrif
I don't understand that either...I thought that people walked around with hands-free kits to avoid plonking a radio transmitter against their grey matter...so why replace the radio transmitter on the phone with a transmitter in the earpiece...which is arguably closer to your brain!!!
I have one, I use it in the car to be legal, it sits in the drinks holder until the phone rings then it goes in my ear to have the conversation, after which it comes right back out again!
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A bluetooth radio transmitter has a far lower output power than your cell phone. after all the signal has to go a few meters not miles!