The product is a new ABL-B Battery with a capacity of 48Wh designed for iRobot Roomba S9, S9+, and S9550 robot vacuum models. It is a gray-colored rechargeable battery with a power source of 4400mAh, suitable for replacing the original battery in the mentioned iRobot models. The set includes one battery and is compatible specifically with iRobot brand vacuums. This high-quality battery ensures long-lasting power for efficient cleaning performance.