Looks like a low-energy bluetooth enabled 'beacon' that allows you to track your Systainers.
I would guess each has a unique 'serial number' so you can take inventory and perhaps be alerted to items that are no longer within 'range' perhaps for theft prevention.
Smartphone app probably allows you to assign the beacon serial number to your tool for asset management.
With the 'locking pin' feature it might enable the catch to be 'locked' preventing access to the Systainer unless you have hammer, screwdriver, pliers, etc. Not totally clear from the simple description on their website.
I think Bosch and others are exploring this for job site tool management.