1. Ergonomics: Although the definition of ergonomics varies from brand to brand, the mouse should at least contour to the shape of your hand. The only downsides are that there is usually a learning curve while you adjust, and ergonomic mice aren’t ambidextrous.
2. Size: As with ergonomics, size definitions differ from one brand to the next. What qualifies as “full sized” or “travel sized” may not be what you’re used to or what you need. Also check out the computer display in the store to get an idea of what’s comfortable for you.
3. Battery Life: If you go wireless, you’re going to be replacing those batteries from time to time. To extend the battery life of your mouse, look for one that comes with an on/off switch and use it.
4. Receivers: As with battery life, this is a concern for wireless mice. Does it use a full-sized receiver that juts out of the laptop, or does it use a nano receiver that lets you pack away the laptop without needing to be removed? Does it come with a receiver placeholder? Having a magnetic placeholder or a designated slot is immensely helpful.
Likewise, check to make sure the mouse comes with the appropriate receiver. This usually isn’t a problem for mice that use 2.4GHz wireless technology, but many mice use Bluetooth and often don’t come with a Bluetooth receiver. Check to see if your computer has integrated Bluetooth before you purchase a Bluetooth mouse.
5. Programmable Buttons: As with ergonomics, programmable buttons can be indispensible time-savers if this is going to be your everyday mouse.