I've been using this for about 7 years. The cursor movement and clicking work fine, but sometimes the scroll wheel feels a little unresponsive. The battery compartment has no battery leakage, and while there's a sense of use, it's still in good condition, I think. Because it has been used for a long time, please purchase only if you understand the above. Two AAA batteries are also included. - Brand: Microsoft - Model Name: Surface Mouse - Color: Gray - Included Items: Instruction manual, original box - Connectivity: Bluetooth - Power Source: 2 AAA batteries Thank you for looking.