One: voltage. The voltage needs to be confirmed first, usually 3v, 12v 24v, 110v, 220v, 360v, 400v, etc. Customers generally have their own fixed voltages, and you must determine how much the voltage is before purchasing.
Two: heat loss. Different heating environment, the heating object is different, the heating area is different, the loss of heat loss is also different, you need to tell us when designing.
Three: temperature. Set a required temperature, (what is a suitable heating temperature, whether to control the temperature, or do not need a thermostat, unplug the power after the temperature is enough).
Four: power. It calculates per square/w according to the area of the heating pad.
Five: size. Because the size not only affects the heating temperature, but also directly affects the price. Different sizes, the price is different.