Raspberry pi b 2a 5v power supply with micro usb stontronics t5661rw the stontronics 5v 2a micro usb power supply allows you to make the most of your raspberry pi b with twice the power of a standard raspberry pi psu one of the key evolutions of the b was the redesigned power system and another was the upgrade to four usb sockets the first means the pi can handle more power and the second means that it needs it help banish brown outs from your pi experience stontronics t5661rw raspberry