Zwift can connect to your various devices (trainer, HR monitor, etc) via either ANT+ or Bluetooth. ANT+ is the most common method, especially among Windows PC users.
ANT+ USB sticks (sometimes called “dongles”) plug into your computer, allowing communicating back and forth between your computer and your devices (smart trainer, power meters, heart rate/cadence/speed monitors, etc).
- Garmin: Reliable and recommended by Zwift, ~$31 on Amazon
- Suunto Movestick Mini: seems to be just as reliable as the Garmin, also ~$25 on Amazon
- Anself: These seem to work just as well as the dongles above, for a fraction of the price. Ships without documentation, but who needs that? ~$15 on Amazon
While you’re at it, get a USB extension cable. They’re cheap, and allow you to move your ANT+ stick as close to your trainer as you’d like. The AmazonBasics cables work well and only cost $5-$6.
Problems getting your ANT+ stick to work with Zwift? Check out this support page.