A Sprocket is a small printer
The Sprocket is a small HP photo printer that you can use with your smartphone or tablet. The Sprocket uses no ink (in the traditional way of liquid or powder on paper), it uses zinc technology (developed by Polaroid). Here you use special Zinc paper for: Paper that is coated with multiple layers of transparent dye. The dyes are activated in the printer with heat pulses from the thermal print head. So with the HP Sprocket you can always have your printer with you and actually print out your selfage: With the printer app and connection via Bluetooth you get the old fashioned Polaroid feeling back, and you can hand that beautiful picture directly to Grandpa or grandma Without a computer. Https://www.youtube.com/watch?v=x1VYesDRiPM