The Logitech LX7 has five buttons. The clickable scroll wheel is accompanied by two buttons below it, which are useful for navigating backwards and forwards on websites, or can also be used as extra weapon controls when playing video games. These two buttons are, on many mice, located on the side, where the thumb normally lays. Personally, I prefer the LX7's approach when it comes to surfing the internet. The two buttons are forgettable when not desired, but can easily be activated by moving your index finger slightly to the left or right of the scroll wheel. The trade off is that when using them repeatedly over long periods of time, their operation becomes less ideal than buttons located near the thumb. The scroll wheel itself is executed well. It is light and crisp, and does not hesitate when clicked, although the amount of pressure needed is to high. The normal right and left buttons follow in the same vein. They require little effort to depress and don't demand much travel from your fingertips, but there is also an audible click providing you with a sense of feedback. I find this preferable to many recently introduced mice, many of which also minimize finger travel, but introduce a spongy feel.
As mentioned earlier, the LX7 is a wireless mouse. This means that it runs off batteries, and it must connect to your PC via wireless radio. The wireless USB doggle that comes with the LX7 leaves much to be desired. It looks and feels cheap, and in my testing, it proved its cheapness when the plastic shell covering the internals of the doggle came off. This caused no harm to the hardware, but it made getting the doggle out of my PC a trial, because the plastic shell is the only part that protrudes once the doggle is inserted. The LX7 displayed only a few hiccups in terms of connectivity to adapter, but its range was less than I had hoped. I noticed a decline in accuracy and responsiveness after moving about six feet away from my PC. The battery life, on the other hand, was solid. The LX7 only requires a battery change every six months, although it should be noted that this was less than Logitech's claim of 8 months.
The LX7's most unique feature is its "invisible" optical sensor. These days, you've probably gotten used to having a red light shine in your eyes whenever you accidentally turn your mouse upside down. The LX7, however, has no visible light at all. Don't ask me how it works - to be honest, I don't know - but I like it. It doesn't make or break a mouse, but I do wish all optical mice would move to using this feature.