More powerful battery The capacity of the battery is 2000 mAh, can work for 8 hours when fully charged, just need 2 hours for a full charge, and it also can work normally when charging. Easier operation Startup - adjust the voltage - work. It's very simple. No need for extra operations can enter the working state immediately. More humane details 10v start-up function at the moment of starting The remaining power is displayed. Working hours are displayed. 3 pcs of space aluminum grip with different diameter 2 pcs of disposable silicone grip. Random color will be shipped if the one you ordered is out of stock. Compatible with all the Dragonhawk cartridge needles.Specifications:Motor 12V/10500Rpm coreless motorWorking voltage 5-10vNeedle stroke 3.5mmNeedle protrusion:0-4.5 mmSuggest voltage for lining: 7.5 V-9 VSuggest voltage for shading:6V-8V