Portable and Convenient : Take your coffee on-the-go with this portable electric coffee grinder that's easy to carry around. USB Charging : Charge your coffee grinder quickly and easily with a USB cable, making it perfect for those on-the-go. Ceramic Grinding Core : The ceramic grinding core ensures a consistent and even grind, giving you the perfect cup of coffee every time. Up to 90g Loading Capacity : With a loading capacity of up to 90g, this coffee grinder can handle a variety of coffee bean sizes and types. Specification: Item type: Electric Coffee Grinder Power Mode :USB Charging Color :Silver Material : Stainless Steel+ABS Voltage : 3.7V Product size :21.5*7.8cm Output power :5W Battery capacity :1200mAh Gear adjustment: 5 gear adjustment (adjust the grinding thickness) Usage : 1. Open the top cover counterclockwise and put the coffee beans in 2. It is also recommended to fill the top jar with 80% coffee beans to ensure smooth use of the coffee grinder; 3. Double click the button to grind coffee beans 4. If the battery runs out of power, use a USB data cable to charge it. After the battery is fully charged for about 3 hours, a green charging light will be displayed. 5. The chip is equipped with a protective device to prevent excessive temperature. It will automatically stop after about three minutes and can grind 2-3 cups of coffee. Attention : Please do not wash the machine with water as it may cause damage to the motor. Use a brush to clean the grinder.