Wireless mouse with trackball function, featuring comfortable operability and multi-function buttons. I'm selling it because I'm replacing it with a smaller one, even though I've used it for about two years. Please note the following, as this item is being sold as junk. Notes: * There is a feeling of use as it was used almost every day. * The LED does not light up, making it difficult to register with Bluetooth. * Despite the above, you will need to try registering with Bluetooth several times (see photos). * Please purchase only if you agree to the above notes. - Model Name: MX ERGO - Brand: logicool - Ball Type: Trackball - Number of Buttons: 5 buttons - Connection Type: Wireless - Color: Black Thank you for viewing.