Logitech Wireless MX ERGO Color: Graphite Connectivity Technology: Bluetooth Special Feature: Trackball Missing Items: Receiver, charging cable Movement Detection Technology: Optical Number of Buttons: 8 I used this for about six months. I am selling it because I purchased the new model. There are no problems with using it. Also, there are no noticeable scratches. Trackball mice may or may not suit everyone. Even among trackball mice, the feel of this mouse is different from others. In particular, the good thing about this product is that the tilt angle can be adjusted to 20 degrees. This adjustment made my shoulders and wrists feel more comfortable. I recommend this product to those who are using a trackball mouse for the first time. This is a high-performance trackball mouse from the Logitech MX series, which is designed to reduce fatigue in the arms and wrists. You can use it in a space-saving manner because you operate the cursor by moving the trackball without moving the main unit. The tilt angle can be adjusted to 20°, allowing you to use the mouse in a hand position that is closer to natural, reducing muscle tension by 20% compared to a regular mouse. There is a precision mode button that allows you to change the tracking speed, and you can instantly switch between speed mode and precision mode with the push of a button. It is equipped with a tilt precision scroll wheel that allows for horizontal scrolling and middle clicking, as well as left and right tilting (tilting sideways). The Easy-switch function allows you to easily switch between two connected devices with the push of a button, allowing you to switch devices without stress. Connectivity: Compatible with Bluetooth or Unifying USB *Please note that this is not a silent type. *Please be aware that this is a used item. #Logicool #mx ergo #Logitech #Fast charging #Compatible with Windows, Mac, and iPad OS #Domestic genuine product