To charge Shelfy, simply take Shelfy out of the refrigerator, place it on a dry surface and let it acclimatize for about a quarter of an hour to avoid condensation. After that, separate the 2 outer shells and connect the included USB-A/USB-C charging cable (or another compatible one) to the socket on the side of the inner shell.
When the device is charged, the LEDs around the center button light up green.