Logitech Mis M575s Ergo Trackball Wireless Black

Sensor technology: Logitech Advanced Optical Tracking, Nominal value: 400 dpi, Max value: Up to 2000, Number of buttons: 5 (Left/Right-click, Back/Forward, Scroll-wheel with middle click), Number of customizable buttons: 3 (Back/Forward, Middle click), Weight: 145 g, Battery type: 1 x AA battery (included), Battery life: up to 18months, Connection Type: Logi Bolt USB Receiver, Bluetooth Low Energy Technology. 80% quieter click noise compared to ERGO M575.