Input: AC 100~240V, 50/60Hz ; Output: DC 3~36V Adjustable, Max 4A 144W ; It can supply with any voltage between 3~36V, such as 3V 4V 4.5V 5V 6V 9V 12V 16V 19V 21V 24V 26V 28V 30V 32V 36V, etc and any amp less than 4A, such as such as 300mA, 500mA,1A, 1.5A, 2A, 2.5A, 3A, 3.5A, 4A LED display show the output voltage, if the current drawn exceeds 4A, the power supply be damaged soon. Never overload! 1.The knob can be adjusted more evenly. 2. Increase the off gear to turn off the power without pulling the plug. 3. Add a polarity converter cable and test lead which compatible with more devices, doubles its range of application. 4. Built-in multiple safety protection systems. Automatic over voltage cut-off, over current cut-off, over temperature cut-off, short circuit cut-off. No noise, no spontaneous combustion, no explosion, no fire hazard, safe to use. It comes with an 5.5x2.5mm tip and 14pcs frequently used tips: 6.5x4.4mm+Pin, 5.5x2.1mm, 5.5x3.0mm+Pin, 5.0x2.5mm, 6.3x3.0mm, 5.5x1.7mm,