"Introduce mugs and cups with special sensors that would give a voice alert like 'This is your third coffee today', 'Your coffee is getting cold', 'I am empty; refill me if you want', and so on." - would these sell well at Christmas?
This product sounds quite good, it's a new product which is interesting. It can make people happy while they are drinking. I think the piont of this peoduct is not how useful it is. It's just new and for fun. People maybe would like to have one or buy one as a present. This product also can buy it for childern, they will interested in it. So I think this product do have a market. Maybe it will have a good sale.