The USB connecter is used for power only, giving you flexible options for where you install the device.
If you need a USB plug for the GlowStick (which is USB powered), you can get one here.
The transmitter is battery powered and requires 3 x AA batteries which are not included.
We do not currently support three phase monitoring within the Bright App but that is coming. You can capture all three data feeds by purchasing two additional clamps and using our APIs. If you intend to do this please contact us first so we can help you get your order right.