GTC released its C4 protection cover for USB flash drive (San Disk CZ55). The cover is made with GTC waterproof technology and enable the non- waterproof flash drive to be waterproof by just adding the cover on it. The flash drive with the protection cover is designed to be mated with GTC C4 USB lock type panel connector, GT111200-10. For more info about this product please feel free to contact us. If you have any question, please don't hesitate to keep contact with us.