Free Linked develops technology-based safety and comfort products. Innovating in bi-directional communication systems underwater on the basis of ultrasonic is their core competence.


Free-Linked develops technology products in the field of safety and comfort. Our specialization lies in bidirectional communication on the basis of ultrasound. The innovation finds its first application in a preventative warning system for sport diving. The pioneering technology which was developed by us can be transferred to a range of applications.

We constantly work on the further development of this technology. Our goal is to be market-leading in the field of safety and comfort systems as well as to access new fields of application for information transfer on an ultrasonic basis.    

Our products will lead to a new dimension of safety. They support the perception of humans when their senses reach natural limits.

Product and Services

Buddy-Watcher represents a distance control system for scuba divers. The dive partner, called ‘buddy’, plays an essential role, since his presence underwater may be life-saving.

Worn by two dive buddies, Buddy-Watcher reduces the risk of the divers losing contact to one another.

Buddy-Watcher is the wireless alternative to the safety line.

ESA Business Incubation

Free-Linked GmbH is hosted at ESA Business Incubation Centre (BIC) Darmstadt, run by the German company cesah. This has provided the opportunity to consult ESA experts who have supported with technology insights and ideas to improve the system.

In addition, especially the support provided by cesah in relation to general business activities has been very helpful.


Free-Linked GmbH

Tiefenbronnerstr. 65

D-75175 Pforzheim

Fon +49 7231 / 28 6361