Specifications Battery Capacity: 1800mAh Display: IPS HD Display Display Resolution: 172*320 PPI Operating Frequency: 30-160HZ Motor Type: Sensing Brushless External Rotor Motor Motor Dimensions: 20*15mm Maximum Motor Speed: 12V 12000RPM Handle Dimensions: 40.28mm x 38.17mm x 33mm Machine Height: 128mm Stroke: 4.2mm or 5.0mm Batteries: x2 Features: 1. New packaging for easy portability. 2. IPS high-definition display for easy monitoring of machine status. 3. Fixed stroke for greater force transmission and reduced machine wear. (4.2mm fixed stroke) 4. Three grip sizes for better feel for artists. 5. Black Colour 6. Timing function for convenient billing. 7. Three preset modes for quick selection of the working mode. 8. Compared to traditional machines: Two intensity adjustment methods: ...A. Adjusting the Hertz to change the intensity. The voltage changes with the Hertz, allowing artists to find their preferred setting. ...B. Ten fixed intensity adjustment levels, with the ability to readjust the Hertz to change the intensity again from the current setting. 9. Warranty provided: One-year warranty for non-human-caused damage.