The document compares the specifications of the PSP, Nintendo DS, and Nvidia Shield including their price, screen size and resolution, CPU, RAM, graphics processor, battery life, and storage. The PSP has the largest screen at 5 inches with 960x544 resolution and 512MB RAM while the Nintendo DS has two screens of 3.53 and 3.02 inches with 128MB RAM. The Nvidia Shield has the most powerful specs with a quad-core ARM Cortex-A15 CPU, 2GB RAM, and 72 GeForce graphics cores but the highest price of $299. All three devices have a battery life of 3-5 hours.