SANWA Vertical Trackball Mouse, 2.4G WirelessBluetooth Ergonomic Rollerball Mouse, Programmable Silent Buttons, 3 DPI, Precise Thumb Control, Wrist

The SANWA Bluetooth + 2.4G Wireless Trackball Mouse has garnered mixed reviews from customers, highlighting both its ergonomic design and some significant functional drawbacks. On the positive side, many users appreciate the vertical design, which is comfortable and offers a natural hand position. Comments suggest that it fits well for medium to small hands, with some users lauding the silent buttons, making it ideal for environments where noise is a concern. Connectivity is frequently praised, with users reporting smooth and immediate connections via Bluetooth and USB dongle. However, the product's reception takes a downturn due to its performance. Numerous users have reported issues with the trackball, citing it as "not very smooth" and causing frustrating cursor lag, making precise selections difficult. One reviewer complained about the trackball being hindered by rough edges inside the device, while another noted that this performance issue seemed unrelated to connectivity. Additionally, the provided instructions and links for software downloads have been criticized for leading to 404 errors, further complicating the user experience for those looking to customize button functions. Overall, while the SANWA mouse offers a promising ergonomic design and adequate connectivity, its trackball functionality and support resources leave something to be desired. It appears to be a budget-friendly option, but potential buyers should weigh these drawbacks against their needs for precision and reliability. **