The MX Ergo S is a trackball mouse - that means you don't move your wrist, just your thumb. Its ergonomic 20-degree tilt angle will keep your hand and wrist in a natural position. So you stay comfy during long work days. You can have it connected to 2 devices and switch between them using the Easy-Switch button. Perfect for boosting your productivity. Good to know - It charging using the USB Type-C port and a single charge gives you up to 120 days of use - The quiet click button mean you won't get dirty looks when you work in a library - Use the Logi Options+ app to customise the 6 programmable buttons - For connectivity you can choose between Bluetooth and the Logi Bolt wireless dongle - Work across multiple devices and operating systems with the FLOW technology (Logi Options+ app required)