Look for “Airprint” capable printers.
If it has Airprint, then it will work with your iPhone/iPod Touch/iPad devices.
If you are printing using the computer, then a wired connection to any printer will work fine.
Printers brands have differing models and availability. Ask the support team if you have a model in mind.
Here's a list of printers from Apple.
If you have a wireless-printing printer lying around where you can print using their app but is not AirPrint capable, then it's possible to export the note from SeriousMD and print it through their app (HP Smart, Epson, Brother, Canon App, etc) - it's just an extra step of exporting and another extra step to switch apps.