4. Built-in 4000mah (21700 model) or 2000mah (18650 model) rechargeable lithium battery, super long battery life 2. Most of the common turbo fans on the market are 3D printed shells. This product uses ABS injection molding material, which is more . Features:1. It uses a high-speed brushless motor with a diameter of 29mm and a speed of 130000RPM, with strong wind power and multiple uses. 3. The body size is small and portable, and it can be held in one hand. It is very convenient to use indoors or outdoors. 5. Supports stepless speed regulation, whether it is used to clean keyboard dust or for home cleaning, it is easy as pie, Weight: 0.79697107713 pounds, Manufacturer: Kueohse