Using your mini thermal receipt printer starter pack is a breeze. First, take out the printer and use the included cables to connect it. Attach the plastic mounting shims if you want to fix it in place. Then, load the 50 - foot long BPA - free thermal receipt paper into the printer. Next, connect the 5V 2A power supply to the printer using the 2.1mm DC jack adapter. You're all set to start printing! When it comes to maintenance, keep the printer in a clean and dry place. Avoid exposing it to direct sunlight or extreme temperatures. If the paper gets jammed, gently pull it out. For the power supply, make sure it's not overloaded. Also, when you're not using the printer for a long time, unplug the power supply to save energy.