Easy-to-use: simply connect heat it to your smartphone. Select the treatment according to your personal preference. After a short warm up, gently place the device on top of the bite. The app will tell you when the treatment is successfully completed. Personalise the treatment to each family member's sensitivity with the heat it app. Heat-it is perfect for the whole family thanks to the child and sensitive skin modes. Uses the proven principle of concentrated heat without any chemical agents. The itch is the body's reaction to the mosquito's saliva. Our body defends itself against it by releasing histamine. The blood vessels dilate, the bite swells and begins to itch. By heating the skin area, various endogenous reactions areinduced that can relieve itching and pain.Heat-it does not use external batteries, it is powered from your smart-phone. Features: USB-C Connector for use with Andriod with USB-C and iPhone 15 and newer JUST HEAT IT - The insect bite solution you've been itching for!