This is for older versions of the software, version 2.6 and below. If you want version 3.0, then a dongle is no longer required. If you buy this, then you can still bind this dongle with version 3.0 after everything is installed. Please see this link: https://www.microsoldering.com/how-to-install-zxw-tools-3-0-with-an-existing-dongle/
ZXW Tools Dongle shows traces on logic boards of most iPhone, iPad and Samsung models, along with many other mobile devices. It’s an essential piece of software for board level repair. The way that it works is that the dongle acts as a security key to access the freely downloadable software. The security key lasts for a period of one year, then you will need to renew or buy a new one.