Type1:
1. Without LED Display. When you adjust the voltage, need a multimeter to test the voltage specific value.
2. Input: AC100-240V 50/60Hz
3. Output: DC 3-24V 3A

Type 2:
1. With LED Display. You can see the voltage value very clearly by led display.
2. Input: AC100-240V 50/60H
 
Features
-High quality components
-Upgraded regulated power supply, made of compact PC+ABS engineering plastic, high efficiency, fast charging, low power consumption and anti-interference.
-Adjustable voltage power controller, just adjust the required voltage through the switch knob.
-Real-time LED volt display function, helps you control the charging voltage so that your equipment achieves an optimum charging state.
-Universal AC/DC adapter, voltage input range 100-240V, suitable for different countries and regions of power supply demand.
-Advanced design, securely protects your devices from over voltage, over current, short circuit and over temperature.
-Widely used for LED strip lights, wireless routers, DSL modems, network hubs, switches, LCD, security cameras, DC motors, tablets, laptops, electric fans, set-top boxes, DVDs, Digital TVs, micro drills, monitors, speakers, etc.