Require to buy adapters 6 to 8 euros each

I bought 2 inverters simultaneously: a eaton 1200 and this one. The perfect eaton; APC it forces me to buy adapters 6 to 8 euros each to use it. I asked to return it because of incompatibility in Bora computer; they agreed on condition that I pay transport. If amazon was well displayed in these connectors unsuitable product description, I would never have bought the equipment. I consider myself harm and am disappointed.