its FREE download it!. https://play.google.com/store/apps/details?id=com.thinkerthing.drfluffsrobotfactoryfreeThis retrotastic 3d printed robot has a slot for a USB pen drive. Print him in precious metals or plastic and add him to your key ring for instant retro cool. Fits kingston DTSe9 usb pendrive (not included) http://www.amazon.com/Kingston-Digital-DataTraveler-DTSE9H-16GBZET/dp/B00DYQYITG .