Model Name...MX Anywhere 2 Connection Method...Bluetooth + Unifying USB Receiver Model Number...MX1500 This is the MX Anywhere 2 from Logitech, synonymous with high-performance mice. I've also used the MX Master series, another high-performance mouse from Logitech, but it was too large and difficult to handle. This MX Anywhere series is the easiest to use and was perfect for PC work. There are no functional issues. I've also used the MX Anywhere 3, but the automatic switching between ratchet and free-spin modes on the wheel meant that the MX Anywhere 2, which allows for manual switching, was often easier to use in many situations. Compared to the MX Anywhere 2S, there are no significant differences in functionality. Personally, I feel that this model, which originally features dark gold trim, has a more luxurious feel and satisfies the desire to own it! I believe the battery is also in excellent condition. After a full charge, it lasts for several months even with over 5 hours of use per day. It connects easily via Bluetooth and is comfortable to use. It is also possible to connect using the included Unifying USB receiver. I am also listing this on other flea market sites, so it will be first-come, first-served. Please forgive me if it sells out.