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https://www.ai-doll.com/siliconedoll/siliconedoll-p-59109.html
https://www.ai-doll.com/siliconedoll/siliconedoll-p-59114.html

This is a more standard and prevalent way of heating the sex dolls. Many seasoned doll owners prefer the external heating systems over the new in-built heating. Generally, the doll manufacturers provide their customers with the option to add this device when they invest in a love doll. This simple device can be plugged into the doll and that’s all it takes. Once plugged, the device will heat up the doll’s body to the optimum temperature.