WALL-E is a sentient, 700-year-old solar-powered mobile trash compactor robot, and is presumably the only functional robot on Earth. He is designed as a small compactor box with all-terrain treads, three-fingered shovel hands, and binocular eyes. He is equipped with a cutting laser between his eyes and a recording device which he uses to record and play his Hello Dolly music. He is very curious, lonely, kind-hearted and endearing, and always puts others, namely EVE, before himself on his journey to earn her love. He also collects objects that have been left on Earth (like a cage full of rubber ducks, a plastic spork, a Rubik's cube and a golden trophy, for example), has a pet cockroach named Hal (whom he feeds Kremies, a Twinkie-like confection, due to the popular misconception that they never expire), and is very interested in music. The truck is his only home.
Source: Wikipedia, "WALL-E", available under the CC-BY-SA License.