The product is a lot of four genuine Dell laptop batteries with a capacity of 42wh and a voltage of 11.4V. These black batteries are compatible with various Dell Latitude and Inspiron models, including the 5400, 5410, 5500, Precision 3540, M3540, and 3550 Series, as well as the Inspiron 7590, 7591, and 7791 2-in-1 Series. Each battery has a Li-Ion type and comes with a cable for easy installation. This product is ideal for those looking to replace their old or worn-out laptop batteries with high-quality Dell batteries.