This is the same as the SPK_WRT Kit except the surface mount parts have already been soldered.
This kit lets you add up to two serial ports to a Linksys WRT54G(L) router. By re-flashing your router, you can run custom code to turn it into a wireless “routerBot” that controls servos, or talks to other electronics via serial (like an iPod or RS-232 port on a computer). Each port can use either TTL or RS-232 levels depending on wiring.
Click here to get Assembly Instructions.