After some prompting by atlas i am going to write a quick primer on SBCs, what they are, what they can do, and how they can benefit preppers, and basically anyone else. SBC means. single board computer, they can fit inside an altoids tin (at least most can) and can function as a complete desktop computer on about 5 volts of power. Perfect for offgrid use! They are open soure, meaning that you can easily install any operating system you desire considering the Hardware you are using, but generally it will be linux or android, loaded onto an SD card that will serve as your hard drive. (At least a class 10!) These little units often come complete with a manual, jumper wires, and other electronic parts that you can insert into the board yourself to control ANYTHING. robots, check. Moisture sensors to water your plants, check. Home security system, check. These devices are like lego building blocks, you can create your own circuits, and your own devices, without fear of what information is being collected, it is your project from start to finish. These devices cost $35.00! I would recommend the Rasberry pi, it has a massive support community and the newest version comes with built in bluetooth and wifi...a quick YouTube search will provide you with endless tutorials on getting these things working. In this picture is sample of the peripheral devices you can attach. Plugged into my SBC is a software defined radio reciever....it basically lets you listen to everything. Pilots, astronauts (not kidding) , police frequencies, even cordless phones and baby monitors...and if that doesn't scare you, one of the other boards that stacks on to it will allow me to view RFID tags allowing me to write my own...workplace badge....swiped! I don't recommend illegal activity, i am simply bringing to your attention the possibilities of these devices. Stay safe, and do some research!