The XBee Shield simplifies the task of interfacing an XBee with your Arduino. This board mates directly with an Arduino Pro or USB board, and equips it with wireless communication capabilities using the popular XBee module. This unit works with all XBee modules including the Series 1 and Series 2 (and 2.5), standard and Pro version.
These large Tiller Traction Lug wheels are 13" in diameter. They come as pair and have steel 5/8" diameter shafts and bearings.
A master battery disconnect switch is a lever-operated battery cutoff switch that will disconnect power for the battery circuit.