They lost their annoying USB cables, but in the process wireless mice also gained an appetite for batteries. Recently they've been put on a power diet, but Digitz's EZmouse goes double deuce on the rechargeable batteries so you never need to hunt down a fresh AAA ever again.
The mouse's main rechargeable battery is good for about four to five weeks of use before it needs to be removed and connected to a USB port on your computer for charging. And to ensure you can keep on wirelessly mousing while the main battery's powering up for two hours, a smaller, non-removable backup provides up to three days of additional use. When the main battery is topped off and re-inserted into the $50 mouse, the backup then automatically recharges itself so it's ready for the next time it's called upon. A feature I wouldn't mind seeing added to digital cameras and other devices with removable rechargeable batteries.