This is a really handy little Nano board with an Uno form factor, so you can use standard "Uno Shields" with appropriate connectors. It comes with a Nano socket, barrel jack for 5V power and 3 pin headers (signal line + 5V and GND) for D0-13 and A0-A7. RX/TX and SCL/SDA are also brought out to headers.

We don't make these, they are a commodity board available on many marketplaces, but it follows our philosophy on Nano break out boards so we're offering them. You can do better in quantity on off-shore marketplaces but since you're on our site, give one a try!