Heavy Duty Grinder: Powerful high quality grinder. 24000 RPM high speed stainless steel blades will grind as fine or as coarse as you need in seconds, glass viewing window design allows you to check the grinding progress. High Capacity Battery Power: Super-high 1400 mAh capacity herb grinder can be used 300-500 times for an average of 30 days of usage per charge. Certified Safe: The herb grinder will not operate when the stainless steel blades are exposed preventing injury. High-quality battery cells ensure complete protection. What you get: Best Herb Grinder, Micro USB cable, herb grinder brush, welcome guide, our 2-Year warranty, 30-Day money back guaranteed and friendly customer service. Ultra Compact: Remarkably small tubular design fits in any pocket or bag. Package include: Product Dimensions: 6 x 1.1 x 1.1 inches Item Weight: 6.3 ounces It contains 1 manual, 1 USB charging cable, and a high-quality electric cigarette grinder.