A:AnswerI plugged my printer with a 10/100 ether port into the extender and it works. Both the printer and the extender are across the house away from the router. Both hooked up wireless.
A:AnswerSimultaneously? Yes, but not with each other. This means you can add another extender to the router, but not "piggy back" on another*. If the other area of the house is further than recommended range of the unit, buying another will not help.
* note: you could try to piggyback but wireless performance will be affected. You take your chances. Good luck.
