This project uses an USB-A female cable as output of 5V while a male power jack connector is utilized as input of 9V. Assembling together the 5V voltage regulator and mounting on this the male power jack, it constitutes a solid device joined to the USB-A female cable. Being practically a input/output cable, this project. You can assemble two projects in-one; that is, one for being utilized with 9V battery and other with a 9VDC charger, 300mA.
*Important Note: the following components are not included in this kit
9V Clip Battery
9V Charger, 300mA