For the ski boardYou dont need install our item number 3 (25x5000mm strap), and dont put the item number 8 (clamping plate) firstly, when all accessories are installed then put your ski board to the Kayack rack. The set up was also relatively straight forward, I simply followed the instructions on the manual and took around 30 minutes to set everything up. 100% water proof. I feel safer listening to music or podcasts but knowing that I can hear things around me. Didn’t fit my 2021 Highlander XLE. My only request would be for this model to be offered in other color combos besides red and black. I am not that handy, so it is obviously easy to assemble. Should’ve read the other reviews, the power button doesn’t light up to indicate that it’s on. They went back My iPad was not holding the charge, it was going down to 65 percent charge and dying.