Fine workmanship internal structure, clear and visible, high-quality materials.LED lights when power supply works,the light color changes according to different voltage, more interesting when you work. Specifications: Weight: 227g Size: 102*98*34mm Voltage: 0-230V? 50/60HZ Output : 0-18V/1.5A Start up Pattern: Press the button twice open Anti-fatigue mode: press one time to start