One for charging (lightning bolt symbol) and one for USB audio connection (the USB symbol).Ħ) Q: Can you record to a USB device and the built-in SD card recorder in the R4R model?Ī: Yes. Most power banks are above 10,000 these days.ĥ) Q: My MixerFace isn’t charging! OR My MixerFace is not recognized by my USB device!Ī: Check that you are connecting MixerFace via the correct USB port. You can use any power bank with USB output - size is not important as long as it’s above, 5000 mAh.