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MP4 is chosen for its balance of quality and small file size.

The MP4 format (MPEG-4 Part 14) is the industry standard for these devices because: 454454 mp4

Likely a watch face animation, a short notification clip, or a wearable app asset. MP4 is chosen for its balance of quality and small file size

If it won’t play, try the free VLC Media Player , which supports nearly all MP4 variants. Security Warning a short notification clip

It is supported by almost every digital device and media player.