Professional Microneedling Pen 6-Speed Electric Beauty Pen with 5 Needles Variable Speed Replacement Cartridges How To Use the Microneedling Pen? Revitalize Your Skin Enhanced Safety and Reliability Versatile and Portable Operation Adjustable Needle Length: 0 - 2.5 mm,Battery Capacity: 380 mAh,Item Model Number: M8,Replacement Cartridges: 5 PCS * 16 Pin,Speed Levels: 6 Levels,Product Dimensions: 5.5 x 0.8 x 0.8 in / 141 x 21 x 21 mm,Net Weight: 0.6 lbs / 292 g,Main Material: Aluminum Alloy