ahhhhhh, I've got on of those that I use with all my hobbywing esc and the mt4 esc (which is a rebranded hobbywing). It allows you to choose if you want no brakes or no reverse, the cut off voltage, the acceleration (punch control), Brake force and reverse force. It makes life easy when it comes to adjusting the stuff I just mentioned, you don't have to count beeps and follow some flow chart. If your not low on cash after getting all that stuff it won't be a bad idea to get one, but its not necesary to run your truck
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