Features: brand new and high quality 3 levels of high, medium, and low battery indicator lights, charging red light, fully charged red light off. 5.5x2.5mm (compatible 5.5x2.1mm)plug is Inner Positive(+), Outer Negative(-),When charging the laptop, the output voltage needs to be adjusted to the same as the original charger output voltage,if the 5.5x2.5mm port can not fit your devices,you need to prepare a charge convertor by yourself. Before use, you need to adjust the output voltage with a screwdriver and a voltmeter,The output voltage must be the same as the original power adapter output voltage.input voltage is AC 100-240V,output voltage adjustment range 12V-24V. Suitable for All in One PC, laptop,Notebook Computer,wifi Router, Modem,LED Strip,Speaker,CCTV Camera and more 12V-24V device. There is a switch to control the internal battery, ON to open, OFF to close, open to start the battery output, and OFF to close the internal battery output,when Using and charging must turn ON the switch. When the external power supply is cut off, it will automatically switch to battery power supply, and the switching for time is 0 seconds. Specifications: Item Type: UPS Uninterrupted Backup Power Supply Material: Plastic Color: Black Capacity: 7500mAh,27.75Wh Size: 16.7x8.3x4.2cm input: AC 100-240V Plug: US,EU,UK(optional) 5.5x2.5mm output: for DC 12V-24V(adjutable) output Power cable length: 110cm Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x 12V-24V Adjutable UPS Uninterrupted Backup Power Supply