DDJ 400 USB power consumption

Does anyone know the USB milliamps power consumption of the DDJ 400? I know it must be under 500mA as the documentation states it requires a USB 2.0 port, but a more accurate number would be helpful. I'd check myself but I don't have a USB tester handy. I ask as I'm playing around with a Raspberry Pi DJ setup and I'm trying to figure out rough total power consumption ahead of purchasing the necessary components. Thanks!