The Kensington Pro Fit Ergo lets you connect with up to three devices using Bluetooth connection and the 2.4 GHz USB receiver. Thanks to the silent switches, you won't disturb anyone if you're working late or in a shared space. And the full-size vertical design keeps your wrist comfortable even when you're at it for hours.Good to know- Customise the buttons with KensingtonWorks to set shortcuts to speed up your tasks- Quickly change the sensitivity with the DPI switch - speed up for gaming or slow down for photo editing- You get up to four months of use on a single charge, no need to worry about running out mid-task