The knob can be adjusted more evenly. Add a closing device. You can turn off the power without unplugging it. Add converter cables and test leads to be compatible with more devices and expand the application scope. Built-in multiple security protection system. Automatic overvoltage cut-off, current cut-off, power cut-off and short-circuit cut-off.This 144W integrated multifunctional AC/DC adapter is suitable for many 3-36V small household electronic products, such as LED light bars, 3D printers, TV boxes, smart speakers, wireless routers, essential oil diffusion humidifiers, USB USB humidifiers, USB USB USB, USBFan, WiFi cameras, USB hub, hard disk boxes, DC appliances, DC water pumps, digital photo frames, DVR NVR monitoring systems and so on. Indoor use only. (Check DC jack before purchase: 5.5x2.5mm, compatible with 5.5x2.1mm) This is a universal power supply, suitable for DC input socket. Widely used in GPS, CCTV camera system, converter, LED strip light, DVD player, DVR, Bluetooth speaker, mobile phone, camera, router, tablet computer, radio, electronic gizmo, replacement charger cable, machine, game machine and many other household electronic products.parameterInput: AC 100 V ~ 240 V 50/60 HzOutput voltage: adjustable from DC 3v to 24v.Output current: 5A maxOutput power: 120 watts max.Output DC connector: 5.5mm x 2.5 (internal "+"and external "-") 14 Tip size: 6.5x4.4mm+pin, 5.5x2.1mm, 5.5x3.0mm+pin, 5.0x2.5mm, 6.3x3.0mm and 5.5x3.0mm.Reverse polarity converter: 5.5mm x 2.1mmPower cord length: 6.56 feet /200 cmWorking temperature: -20~50Plug type: American plug.Voltage: AC 100-240 volts.Packaging content:1 set of variable power supply