Pi-BB-RPS provides Redundant Power Supply capability. Second power is the micro-USB power. Power is switched seamlessly between these two sources. Priority is given to power source with higher power Voltage. DC 5V and 3.3V is generated on the board. The 5V supply is provided to Pins #2,4 on the 40-pin HAT standard header. The board thus provide power to a Raspberry Pi via the 40 pin header or from USB out port. The mounting holes make it ideal to mount Pi-BB-RPS as a HAT.