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Segway's $150 Engine Speaker can play music or
for 23 hours. It syncs with the
. The revving sound gets louder the
the scooter goes. The speaker will warn
in earshot that a scooter is coming. Road
analysts believe the speaker could cut the
of traffic
. However,
worry about noise pollution. They say the
of electric engines is their silence and that a simple beeping sound is
.
