The d-usb adapter from rolux is a handy tool that allows you to use accessories with a female usb-a connector and standard d-tap connector simultaneously with your v-mount battery. The d-usb adapter is suitable for any v-mount battery with d-tap connector. You simply connect the d-usb adapter to the d-tap connector, which has both a usb-a and d-tap port. The usb port output is 5v and up to 1.6a. Both the input and output of the d-tap are 11-17v and up to 10a. Usage d-usb adapter you can use the d-usb adapter to power a device via a usb cable. For example, you can connect the standard usb cable of your smartphone to the d-usb adapter to charge your smartphone. At the same time, you have access to a d-tap port to use, for example, your camera's led lamp simultaneously.