The HP mx330 U3 / A1 / V30 microSD Flash Memory Cards are the perfect solution to expand on-board memory of mobile devices. The U3 / A1 / V30 rating, with read speeds of up to 100MB/s with A1 App Performance guarantees that you can quickly store and share content between devices. U3 technology is ideal for HD photography recording, allowing you to capture high quality content on your action camera, and 4K Ultra HD video drone, or other mobile device.