The camera supports 64-256GB micro SD cards with UHS-I/II (U3) – Ultra High Speed Class with U3 Speed Class Mark.We recommend using the maximum bit rate speed (120MBs) at all times when recording and therefore use U3 microSDXC card type (see image below).Recommended cards (tested by us) :SamsungEVO Plus v2 MicroSDXC UHS-I U3 256GBSamsungPRO Plus MicroSDXC UHS-I U3 64GBSandiskExtreme MicroSDXC UHS-I U3 A2 V30 64GBSanDiskExtreme Pro MicroSDXC UHS-I U3 A1 V30 128GBSandisk Extreme Pro MicroSDXC UHS-II U3 64GB