FS-IA6B Receiver Black Wire?

What is this black circular wire included with the FS-IA6B Receiver? The one in the bottom right that seems to ground itself?

It’s a binding key - will allow you to rebind the receiver to another transmitter if you change transmitter for some reason - or if you have to replace the receiver with a new one. Binding means the receiver and transmitter are linked and won’t work with another random one - meaning you can fly in groups without accidentally interfering with each other.

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