This innovative development, designed in collaboration for Dietlin, is a secure support for a necklace, with no protective glass between the jewel and the customer. The necklace is kept safe by the integration of an alarm linked to a shock detector. The FiveCo team developed a module composed of a motor, a mechanical system for locking the pin, and management electronics. The main challenge of this project was to design an extremely compact 34 x 48 x 52 mm solution.