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you can go test drive a hummer h2 and they will give you 1 if they think you are going to buy the vehicle .
correct me if i am wrong but it is a magnetic feild that illuminates as you jack it off .
the 1 i got from hummer you shake it back and forth (like you are jacking it off ) and it becomes a strong form of light like halogen /quartz what ever the blue lights are that we now see on a lot of vehicles ??
i love to play with it in the dark, and if i stroke mine this hard/long it would have already done the duty if you know what i mean lol !!!! here is a picture of mine
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