The E-Stim 2B™ Digital Link Interface System.
It's a USB driven digital interface that allows you to connect your 2B Power Box to your PC or Mac and update firmware.
Use the Commander2™ software and control your 2B directly from your computer or even remotely across the internet.
Update your 2B firmware using UpLink2™ software which is supplied as part of the digital link interface system.
Supplied with cables and an E-Stim USB stick pre-loaded with official software.