The product looks nice, I was thinking of buying large quantities, but when I tried it I realized that it doesn't heat enough, I understand that it is only for containers with completely flat bases but I don't know, I tried different cups and it only keeps the base warm but not the drink. I connect it directly to my laptop and also plug it in, and it heats up but it doesn't seem to me that it fulfills its main function, which is to keep the drink hot. Delivery was fast tho.