Amazing product! perfect size! It is elegant and can fit into any furniture setting. The app is very simple to use. Even without the app, it is very easy to use. The battery life is perfect. Read more

The best comparison for this mug is the ember heated mug. A family member has an Ember, and I decided to try the Vsitoo S-3 mostly because it holds 12 ounces and the battery is supposed to last 4 hours. Overall, I'm very happy with the performance so far. It does hold more coffee/tea than the Ember. Admittedly, the Ember looks a bit nicer and the Ember app is definitely more user friendly, but the truth is you don't need the app for the S3, which is a really nice added feature. The S3 has a haptic button on the mug to allow you to switch the temperature directly on the mug (you can also do it via the app). The mug's indicators are in Celsius (while the app allows you to view in Fahrenheit). Once you convert once through you it's easy enough to remember that 55 Celsius is 135 Fahrenheit. I tend to keep my mug set around 55-60 Celsius (temps go up to 65C). Higher temps do impact battery life, but the S3 still heats for an extended period of time. One other thing to keep in mind, the mug works best when you start with hot liquid (so that it's not working to heat the liquid, but instead maintaining temperature). The S3 also tends to retain more heat and for longer periods of time when you leave the travel cover on. Because the mug's heating element is at the bottom, leaving the cover on will also help keep the liquid higher up hotter. I don't mind this, but some people may prefer to use the mug without a cover. The mug is really well packaged too; I was surprised by this. Finally, other reviews have already commented on the app. While the android version is a little rough around the edges, honestly once you pair the mug to the app. there's not much more to do, and because there is a haptic button right on the mug, I rarely use the app anyway. If the amount of liquid held in the mug and the overall heating time of the mug are important considerations for you, I think the S3 is a smart purchase. UPDATE 1-29-21- I've ran into some issues with the app and a firmware update. Vsitoo customer servicer responded quickly and I was able to resolve the issue. Great service! Read more

Very good for work time, the quality is good👍🏼 Read more

My dog literally ate the charger cord. I contacted the seller as I could not find a replacement and they were very responsive and helpful. The Cup itself works great keeps my coffee hot at my desk for hours. Doesn't change the flavor or the taste. And it keeps it as hot as you like. I always forget my coffee when I am working and it gets cold, now in this cup it stays hot for hours Read more

O vendedor cumpriu exatamente o descrito. Dele eu não tenho o que reclamar. Já o produto achei bem ok considerando o valor. Bateria dura pouco. Toda vez que você usa, tem que carregar. Para manter a bebida quentinha, tem que manter a temperatura no 60, se não a bebida fica morna/temperatura ambiente. Na primeira lavagem, a tampa já ficou manchada, isso que nem usei a parte abrasiva da bucha, usei a parte macia. Resumindo, o produto funciona, mas não é essas coisas todas. Não compraria novamente. Read more

I bought it last december.. after 4 months charger is not working... now i can't charge my mug anymore.. it is just an ordinary mug for the price of a smart mug.. not worth it Read more

This product stopped working in less than four months ! It won't charge any more and these kind of Chinese products aren't easy to repair any where. Nor the seller or the company care to respond or provide feedback ! And the supposedly touch button never ever worked ! Read more