This is an LG air conditioner featuring a dual inverter compressor, which offers enhanced energy efficiency and quieter operation compared to traditional air conditioners. The 'installment promo 50%' likely indicates a promotion where the buyer can pay for the air conditioner in installments with a possible 50% down payment or other related financing offer. The dual inverter technology provides more precise temperature control, faster cooling, and reduced energy consumption, ultimately leading to lower electricity bills. Expect key features such as efficient cooling, quiet operation, and long-lasting performance typical of LG appliances.