What material is good for hot water bag

Nowadays, there are many styles of hand warmers on the market, some are rechargeable, some are water-filled, we do not care which one we buy to do a comprehensive understanding of this one, so that the use of the time to rest assured that some, first of all, we must understand the net, electric hot water bag factory hand warmer how to fill water, because only add water to it can use it, at the same time, to know the hand warmer water-filled What are the precautions.

Netflix hand warmer how to fill with water?

1, hot water bag sales of a new model of hand warmer, from the front is a doll doll style, from the back is a water heater, you can see 2 plugs, the  is the water filler plug, the following larger is the power cord wiring port.

2, the hand warmer side over, you can see the back of the zipper, zipper fixed in front of the doll and the back of the water heater bag.