USB Input voltage: DC 5V DC output voltage: DC 9V DC plug: 5.5*2.1mm Cable length: 1M USB input: 5V 2A male, Please Make Sure the current is 2A or the device may not work.Note: NOT Suitable for High Current Equipment. 9v to usb voltage adapter has built-in upgraded smart IC chip, which provides perfect overcurrent, overvoltage, overload or short circuit protection for your equipment, safe and reliable It is widely used in 9V low-power equipment such as a wireless router, smart speaker, smart camera, light band, game console, table lamp, breast pump, mini fan, development board,etc. USB to 9V step up cable with DC jack 5.5 x 2.1mm, please check if it fits in the power jack on your devices.