Adjustable wind power and temperature: There are six levels of adjustable temperature at the rear of the machine, 100-600℃. It has two levels of wind power, which can be freely adjusted according to the thickness of your heat shrink cap. Ideal effect: After many tests and customer experience, this product can shrink the heat shrink cap evenly and without wrinkles. It is simple to use and adjust, lightweight and easy to move. Use: Suitable for shrinking heat shrink caps onto wine bottles. The heating tube has a diameter of 50mm and is suitable for wine bottles with a diameter of less than 45mm (1.75 inch). Note: It is normal to have smoke and odor when using it for the first time. This is because the mica sheet in the machine is burning for the first time. Please rest assured that this is safe and will not affect normal use. To do this, you only need to turn on the switch to heat for 5-10 minutes, and there will be no smoke when you use it again. Efficient and convenient: The handheld PVC bottle cap shrinking machine can complete a bottle cap in only 1-2 seconds, and can shrink more than 600 wine caps per hour on average. Suitable for batch , efficient, time-saving and labor-saving.