This should have been fast enough for our Watch and Tesla DVRs, but we kept getting warnings that some clips were not saved due to slow write speed. We bought another product, a SanDisk High Endurance Micro-SDXC card with adapter, and it works perfectly. I do not recommend the SanDisk Ultra Fit USB 3.1 64GB Low Profile Flash Drive for DVRs and security cameras. Take this instead: https://smile.amazon.com/gp/product/B084J46RH4/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1
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