Review on Gigastone 32GB Micro SD Card 100-Pack with Adapter - Perfect for Video Cameras, Security Cameras, Roku & More, UHS-I U1 A1 Class 10, up to 90MB/s! by Will Anderson

if you need it for a smart or in my case a DVR. Save your money, it caused a freeze, hard reset and finally my dash cam stopped working. Recommend sandisk with ultra plus 100mb per second. It's terrible, no deal. Also Revain does not return this product, only exchange it. The seller can be reached via his website. Don't expect a return. I'm hoping to give it to someone who has an older and slower device or it will have to be thrown away.