Specification: Origin: Mainland China Type: Module Condition: New USB booster cable DC TO DC 5V/9V/12V charging treasure booster module DC interface 5.5*2.1MM Specifications: 5/9/12V (optional) Product parameters: 1. Check the voltage and current at the bottom of the ADSL, router, and switch. If the voltage is 5V, choose 5V for common use. If it is 9V, choose 9V for common use. If it is 12V, choose 12V for common use. 2. DC plug specifications: if the diameter is 5.5mm, choose a universal one; if the diameter is 3.5mm, please choose the corresponding voltage and 3.5mm adapter; (3.5MM plug is the same size as the mobile phone earphone plug 3. The products in this store do not distinguish between routers, switches, and optical modem brands. As long as the voltage is the same and the power is not greater than 10W, all products can be used. 4. Product size: 55*17*10mm The difference between the three lines: 5V straight-through: simple power line, USB input is 5V, power DC plug output is 5V 9V booster line: with booster components, the USB input 5V voltage passes through the components, boosted to 9V voltage 0.8*1A 12V direct: with boost components, the USB input 5V voltage passes through the components, boosted to 12V voltage 0.8*1A Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1Pc *USB Power Boost Line, 1.Multiple Voltage Options: The usb power boost line offers multiple voltage options, including 5V, 9V, and 12V, catering to different devices' needs. 2.Compatible DC Plug Size: With its 5.5*2.1mm DC interface size, this usb power boost line is compatible with a wide range of devices, making it a versatile and useful accessory. 3.Brand Compatibility: This usb power boost line is compatible with various brands of devices, as long as the voltage is the same, and wattage is less than or equal to 10W. 4.Small and Portable: Measuring only 55*17*10mm, this usb power boost line is small and portable, making it easy to carry around and use. 5.Boost Functionality: This usb power boost line comes with boost functionality, allowing customers to boost USB input voltage from 5V to 9V or 12V to cater to different devices' needs.