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From my 2012 Street Glide, this is a Kurakyn Pulsating Brake Controller, and a heavy duty load equalizer so it will work with regular or LED converted tail lights.
The load equalizer is not the small one that comes with it, it's a larger one that will support both front and rear LED's.
5498 Self-Regulating Load Equalizer
For use on '90-'13 H-D models (except '11-'13 Softail and '12-'13 Dyna Models). Plug-and-Play installation when used with Kuryakyn Panacea Taillight, Run-Turn-Brake Controller or Load Equalizer Adapter.
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Pulsating Brake Controller and Load Equalizer
