The E-Stim’s 2B Digital Link Interface Link is a USB driven digital interface system designed to allow you to connect your E-Stim 2B Electro box directly to your computer via USB. Various control programs such as Commander2™ will then allow you to control and program your 2B directly from your computer PC or Mac, while our UpLink2.1 software will allow you to update your 2B to the latest firmware.