Wireless buttons are used in express checkouts in grocery stores, with which store workers can confirm the buyer’s age, in case they are purchasing an age-restricted product. Since the button is small and tended to get lost or there was nowhere to attach it, so a pendant was designed and by only using 3D printing was produced. The case locks when the parts are bent and can be easily opened. The final product was 3D printed and processed in a small quantity.
