When Biotrohn devices arrive at our offices, the manufacturer sends them with an empty memory. The USB is used to program them, and this process is only done once. Thus, the Biotrohn's memory is filled with 135 programs. This sets it apart from other similar devices on the market that include only a few programs and require the purchase of additional programs separately. USB can also be useful in case the device crashes due to power fluctuations. In such situations, you can contact our team, and we will provide you with information on the next steps.