Quantity   Component name
1 × Arduino Uno Main processing unit
1 × Adafruit FONA 800 Shield GSM Modem for sending SMS
1 × Arduino Prototyping Shield Just a breakout to attach components and make things more solid
1 × Waterproof(ish) Box Contains the electronics
1 × LM7805 Voltage regulator, used to supply both the Arduino and the FONA 800 chip from the 12 volt supply