SanDisk Extreme 64GB microSD
Recommended 64GB card.
A 64 GB card paired with WavPack lossless compression (no audio quality loss) will outlast the battery—so you’ll never run out of storage before power. Learn more about WavPack here.
Choose 128 GB only if you specifically need uncompressed WAV recording. 128 GB cards typically use more power and will reduce runtimes.
Memory card size is a tradeoff between cost, runtime and capacity. Uncompressed WAV data takes 3.9GB per 24 hours of audio at 24k. WavPack lossless can reduce that to 800-2000MB per 24 hours. Typically this will be at the lower end in real field audio with low configured Gain.