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Design specification: the infrared ray launcher installed in the bus constantly give its signal while the bus is on the way. When approching the bus station within 50 meters, the receiver of the bus transform the signal into voice signal and letter signal, in which way to remind the passengers that the bus is arriving. In this way, the visually handicapped will not in an awkward position result from yelling the wrong bus , the same is true in helping to avoid the trouble of turning around your neck through the bus window to check the target bus.