Check the listing for details. Logitech Ergo Series MX Ergo S - Trackball - ergonomic - optical - 8 buttons -. Condition: Excellent - Refurbished. Listed at 89.99 USD. The Logitech Ergo Series MX Ergo S is designed to enhance user comfort and productivity with its ergonomic design. Featuring a unique 20" tilt angle, this trackball supports a more natural hand position, reducing strain during prolonged use. The Logitech Advanced Optical Tracking ensures smooth and precise movement, while the quiet clicks technology allows for a peaceful working environment. Stay connected effortlessly with Bluetooth Low Energy compatibility and a Logitech Logi Bolt USB receiver, providing options for wireless connectivity. The device is equipped with six programmable buttons and Easy-Switch technology, allowing for seamless transitions between devices. Fast charging ensures that this device is always ready when needed, making it a practical choice for any workspace.