Quantity   Component name
1 × Reactron (Arduino clone) with HopeRF radio based on Moteino, lowpowerlab.com
1 × SPST momentary switch with blue LED any switch will do
1 × Battery holder Sparkfun
1 × Rechargeable battery Sparkfun
1 × Lexan shield implementation dependent
1 × Assorted headers and wires and heat shrink tubing misc
1 × Keurig B60 water tank cover implementation dependent