Warm hand treasure, can be roughly divided into three kinds:
One is heated by heating water, that is, we commonly known as the hot water bag, unlike the traditional hot water bag, the electric kettle to save the trouble of adding water, as long as plug in the power supply and so on 10 minutes to be able to heat, in fact, the inside of the water boil, so the general temperature will be very high.
One is through the chemical reaction to heat, the market warm hand treasure is this type, through the inside of the chemical contact, the resulting heat, temperature of about 40 ℃ around.
The other is the use of lithium battery function, internal heating chip fever, the use of USB interface charge and discharge, and warm hand mouse pad similar to the lithium battery can charge and discharge functions, generally also can be used as a mobile power. Small size, convenient to carry, the temperature can reach 50 ℃ or so.