"Details: Material: Aircraft Aluminum Motor: AVA OEM Metal Brush DC Motor Power Intake: 5W Motor Speed: 10500 rmp Optional Stroke: 3.5mm or 4.2mm Needle Protrusion: 0-5mm Battery Type: 18500 Lithium-ion Rated Capacity: 1600mAh Size: 33mm*109mm Weight: 198(without battery) Advantages: 1. Smaller and shorter. The length is approximately equal to the length of two 18500 lithium batteries. 2. Connecting Rod System. Made it more powful, output more stable. 3. Replaceable 18500 Lithium-ion Battery. 4. High-definition OLED screen. Display voltage, hertz and power. 5. Adjustable anti-slip grip. Color: BLACK"