The HP mx330 Class 10 U3 microSD Flash Memory Cards are the perfect solution by which to expand on-board memory of mobile devices such as smartphones, tablets, action cameras, drones, and more, allowing you to free up space to enjoy more digital content, like apps, eBooks, photos, videos, music, and movies. The mx330 microSD Flash Memory Cards are rated Class 10, U3, with read speeds of up to 100MB/s, guaranteeing that you can quickly and easily store and share content between devices. What’s more, U3 technology is ideal for HD photography and 4K Ultra HD video recording, allowing you to capture high quality content on your action camera, drone, or other mobile device.