ELECOM EX-G Wireless Mouse L Size M-XGL30DBSKWH A mouse developed in collaboration with doctors for an exceptionally comfortable grip. - Brand: ELECOM - Model Name: EX-G - Size: L - Wireless Connection: 2.4GHz Power Source: Battery-powered (1 AA battery) Connection Type: Wireless Other Features: Silent This mouse is designed to be held at an angle to reduce strain on the hand. As shown in the photos, only the mouse and the wireless receiver are included. Also, as you can see in the photos, I noticed some discoloration on the underside rubber of the mouse near the base. I tried cleaning it thoroughly, but the stain seems to have soaked in and I couldn't remove it. I've also taken a photo of the battery compartment, and it doesn't appear to be from battery leakage. I'm not sure if it's the rubber or something else, but the stain seems to be ingrained. Regarding functionality, I've confirmed that it works without any issues, including a web-based mouse check. Since I'm a bit concerned about the current stain, I'm offering it at a reduced price. If you're concerned about hand fatigue, or if you don't mind the stain and are interested, please consider bidding.