I was unable to use this product immediately because I have a newer computer with incompatible ports. It also wasn't "clear enough" that the TF card had to be purchased separately. But I was very impressed with the instant, friendly and responsive support via WhatsApp. If they make the description clearer and provide an option to purchase additional components for the necessary cards and adapters, I think this will be a very good and cost-effective glasses DVR. The product itself looked solid enough and could easily pass for regular glasses.