Logitech Trackball I've had it for a year. I mostly used Apple's trackpad, so it was practically just for show. It supports tilt wheel, which is very convenient for Excel horizontal scrolling, web browser (forward, back) browsing, etc. It supports multi-pairing, so you can register up to two devices and easily switch between them with a button. [Product Specifications] Power... Rechargeable Series... ERGO Model Name... MX ERGO Connection Method... Bluetooth + Unifying USB receiver [Included Items] MX ERGO Advanced Wireless Trackball Unifying USB Receiver Micro-USB cable (for charging) *Manuals are available for viewing on the internet. Operation confirmed. Non-smoking, no pets.