Dual Head Heating Stick LED Indicator Light Heating Stick USB Hand Warmer 42℃ Automatic Control Fast Heating Portable Carrying Outdoor Heating Tea/Coffee/Water, 2 Heaters Combined into 1 Cord

Works fairly fast, about a minute to warm up.

They take a while to heat up but they work good

Only one stick actually heated up and tge other does nothing.

Work as advertised.

It works well but had to replace after 4 to 6 months. Cords tend to short out so be delicate with them. Other than that not a bad product

As the headline stated, these are perfect for warming your doll(s) before use. I cannot give them five stars because the USB cord length is ridiculously short. You may want to buy a USB Cable extender. Otherwise, this would be a 5-star product.

This works decently for a USB heater. It does not heat up as fast as the corkscrew metal electric immersion heater that I have but it does eventually heat up the liquid. It works best with a taller mug as the top gets much hotter than the bottom of the unit. As to be expected, this requires a lot of power and only worked for me when plugged into my wall outlet, my laptop port, and with newer, beefier power banks. I tried with an older power bank that I often take camping and it would not power it. I think this will work out great at outdoor events to keep beverages warm when it's cold. It works best to maintain an already hot beverage but will heat cold liquid if given enough time. The instructions appear to be incorrect as it states that the alternating red and green light means it has reached temp. For my unit, it displayed alternating red and green lights from the moment I plugged it in. In any case, I think it's a decent value for the price and a handy gadget to have.

The indicator for when the warmer is fully heated (flashing red and green) seems to not work correctly, and begins flashing as soon as the warmer is powered on. It gets to a good temperature in about 4 minutes, like it claims to. However, it seems like only the further half of the warmer actually heats up. It was able to warm the deeper parts of the toy I used it on, but the entrance to the toy was still fairly cold.

Super