eMMC 5.1 (Embedded MultiMediaCard) is a type of internal storage commonly used in smartphones, tablets, but F77 innovatively uses it as a built-in storage for dash cam. It integrates both flash memory and a flash memory controller in a single package, making it compact and efficient. eMMC 5.1 is much higher than traditional SD cards in various parameters. Some key parameters of eMMC 5.1 include: Sequential read speeds: up to 240 MB/s, 10x faster than SD card. Sequential write speeds: up to 160 MB/s, 10x faster than SD card. Lifespan: up to 100,000 Read/Wirte, 10x durable than SD card. Capacity: typically ranges from 16 GB to 128 GB.