The Vortex is an interactive Smart trainer with an electro brake. This resistance unit is suitable for an average training level & can reach a maximum resistance is 950 Watt. Instead of using a handlebar computer you train by connecting the Vortex quickly & easily to the Tacx Cycling apps. If you want to train with a PC or laptop you can purchase the Upgrade Smart. Of the many possible training options, you can choose the software that best matches you & your way of training. The Vortex communicates wirelessly via ANT+ & Bluetooth wireless technology. You can attach your tablet or smartphone to your handlebar with a special bracket (optional). What is Zwift?