Mast Nano Rotary Pen Machine. Pen-style rotary machine for use with needle cartridges. Compatible with all standard power supplies. Machine frame are made from solid rods of high grade aluminum then polished and anodized, laser engraved logo.Machine Specifications:Weight: 82gSize:23mm*78mmWorking Voltage: 5-8VMotor: Coreless motor, 8V/9000RpmNeedle Stroke: 3.2mmBattery Specifications:Weight: 64gSize:27mm*78mmWorking Voltage: 6-11VBattery Capacity:1200mAh