The e-mark generates a WIFI-network, which it uses to connect with your mobile device and to transfer data. Your mobile device does not need connection to the internet for the connection to the e-mark.
Do I need connection to the internet for using the e-mark?
No, the data is either directly transferred via USB-connection from a PC to an e-mark or through WIFI from the mobile device (smartphone, tablet) to the e-mark. In the latter case, the e-mark generates a WIFI-network and connects through it with the mobile device. Internet connection is only required if you want to use a certain image from the internet for your self-made imprint, or if you want to share your imprints with other e-mark users.