It's not easy to estimate speed because it's dependent on both the sd-card and the smartphone. Although though the card is compatible with the UHS-1 high-speed standard, few devices actually use it. That's just pointless. As opposed to 128 GB, why 119 GB? This is because of the disparity in the units of measurement; whereas cards are typically 1 GB in size, all devices use 1024 MB, therefore the difference arises.
π½ 512GB Samsung Evo Plus Micro SDXC Memory Card
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32GB High-Speed Micro SDHC Card - Class 10 UHS-I Compatible Memory Card for SD Devices
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Kingston microSDXC 64GB Class 10, V10, A1, UHS-I U1, R 100MB/s Memory Card, SD Adapter, 1 pc, Black
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Smartphone Xiaomi Mi 8 Lite 6/128 GB, midnight black
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Renewed Logitech G PRO X Wireless Lightspeed Gaming Headset with Blue VO!CE Mic Filter for Immersive Gaming Experience
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Apple AirPods Pro MagSafe RU Wireless Headphones, White
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Smartphone Samsung Galaxy A50 4/64 GB, 2 SIM, black
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Logitech HD Webcam C270: Crisp 720p Widescreen Video Calling & Recording (960-000694), Lightweight and Portable at 3.15 lb.
192 Review