...of your cigarette lighter. It has two USB inputs, and powers anything from smartphones to tablets. Plus, R2 lights up, moves, and makes all his trademark robot noises, which everyone in Star Wars can somehow understand. He's like "Beep boop [whistle]" and Luke is like "Oh yeah, that's very insightful R2. I never thought about it that way." But at least he didn't talk like Jar Jar Binks.
Evan Scott Schwartz is the Tech editor for Supercompressor. Never tell him the odds!