infrared
It does not work.
Let them see each other by activating and search for bluetooth network. Use the computer to select the headset and commence the pairing process.
if your frend can do it i would be amazed but the answer is proberly no
500meters
get a girl, a reall noisy, get her to scream and yell and cry and beg to the operaters to hack her boyfriend's voicemail.
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