What is SIGNAL control do in Build > Devices?

[Moors7]

Particle Tools Changelog

##November 2016 11/11/16 - Signal a device We’ve added the ability to “signal” a device in the Web IDE, under the device details view for any Particle device. Clicking the Signal button will trigger a rainbow LED pattern on the selected device. You can deactivate the LED pattern once the device is identified by clicking the Stop signaling button. Note that you can only signal devices that are currently online (breathing cyan dot next to the device name). This is useful when you want to flash …