It shipped with an ethernet cable, power supply and installation CD. Warranty is 90 days (according to linksys' website). http://store.linksys.com/Routers/Linksys-E900-Refurbished-WirelessN300-Router_stcVVproductId149279913VVcatId543906VVviewprod.htm
Power cord, 1 short Cat 5 cable (3 ft I think), install CD. I believe it's a 90 day warranty like most refurbished products. I think amazon has a 30 day return period window on electronics , but not sure about refurb's so don't quote me on that. I checked Sq. trade with a 30 % off coupon, was still around $4.00+ for extended warranty. If the Item dies I"ll just buy another one at this price, my old Cisco/Linksys 54 wrtg B/G router was left on all the time and still works after 5+ years. Unit arrived in a brown Cisco box marked refurbished, but there was not a mark on it, looked new.
mine came with all the cords needed to run it (Ethernet cord and power cord). The warranty I'm not sure about. For being a refurbished unit i was a little worried about buying but I am very satisfied with the product.