This Dell mouse is perfect for portability. At a measly 56.9 grams it definitely won't be weighing you down. And it's twist design has 2 cool features. For storage, it can fold pretty much flat and slide into any space. To switch it on, just twist it into its ergonomic, palm-shaped form factor. Comfy and convenient. You even get the functions of a scroll wheel, but in a clever touch strip that's flatter and more backpack-friendlyGood to know- Use Bluetooth to pair and save up to 3 devices and switch between them with a single press- Microsoft Swift Pair means it can connect to PCs over Bluetooth almost instantly- It comes with replaceable AAA batteries that'll last you up to 2 years with no need to change or recharge- The optical sensor will work perfectly on most desks and you can tweak the DPI to slow it up or down