Yes, this memory card is compatible with the Insta360 X4 Air Starter Bundle. It is of the microSDXC UHS-I V30 type, corresponding exactly to Insta360's official recommendations for optimal use in 8K/30 fps. The 256GB capacity is less than the maximum limit of 1TB, and its read (200MB/s) and write (140MB/s) speeds with class U3 and V30 ensure smooth recordings.