The first Stryd, launched in 2015, was a chest strap based power meter.
In 2016, Stryd introduced the first foot pod. You have the first generation foot pod if the hardware model number is 2 up to 13.
In 2019, Stryd with wind detection launched. You have the latest version of Stryd if the hardware model is 14 or higher.
If you see references to Stryd version numbers (V2, V3, V4, etc.) be wary. Versions numbers do not exist and may not accurately describe the Stryd model. The latest generation of the Stryd foot pod is the Stryd with wind detection.