Love my Kodiak brakes. It took around 2 days of on and off work to put them in everything I needed was in the kit. I think I bought it from E trailer but?? old age you know. It included 2 battery holders and 2 smallish batterys. If you order, tell them you don:t need the batterys. You already have them >they are for the break away. Also I have a 2011 chev with built in controller. The BrakeRite would not work and I needed to get the adapter. Tell them you need it when you order and save the shipping charge and time needed to get it later. Those brakes work SO GOOD. Going down a highway in Northern Wisconsin a BEAR ran across the road. I smoked all 4 tires. Missed him (her) by inches. Probably didn"t help the tires though. Money will be well spent. Would not even look at a new trailer/5fith wheel without disc brakes.