What does the range expander do exactly?

Hi, I would like to know, what does the range expander does exactly, does it only relay a signal farther away or does it actualy amplify the signal. I would like to know because right now there are 3 computers in my house that are only receiving a "weak" signal and I would like to boost that... I can't pass wires through the walls so it has to be wireless...
thanks in advance

The range expandr does increase the range of your wireless signal , However the throughput is reduce by half eg: if you are getting a speed of 54Mbps from the router to the range expander , then from the range expander to the PC your transmit rate be be approx 22Mbps . Every consequent range expander you connect will increase the range , but again the transmit speeds will be reduced by half.

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