Specifications Power Input Voltage Range: AC90-240V Input Voltage Frequency: 60HZ Output Power Range: 0.3W-54W Output Voltage Range: 2-18V. Adjustable Output Voltage Accuracy: ±5% Output Current: 0-3A ±0.1V Duty Cycle of Output Ripple Accuracy: ±1% Net Weight: 150g/0.331lbs Power Supply Size: 90×88 ×28mm/3.54×3.46×1.1in Pen Material: Aluminum Alloy Length: 120mm/4.72in HP Diameter: up to 28 mm/1.1in Maximum Speed: 12000RPM Maximum Input: 12V Stroke: 3.5MM Motor: 5W.