Most power simply won't provide enough power for the board and accessories, such as IR receivers, USB wifi adapters, and USB storage. Not enough power can lead to unreliable performance, locking up, crashing, and rebooting.

This power supplies overcome the shortcomings of the "typical" power supplies that are paired with the Raspberry Pi. The 5 Volts and 3 amps output provides plenty of power for many USB powered accessories