What is the Red Connector from motor Bafang 750W BBS02

[Claus C.]

I know the yellow connector is for the gear shifting cut off, but there is no explanation what the red connector is used for.

 

[Claus C.]

I contacted the distributor and they told me the plug is for a head light which they also sell for $40 only 300 lumens so not sure it’s worth the money