This 5-Button USB Silicone Optical Scroll Mouse is 100% waterproof- a feature that seems totally unnecessary. Why would you need a washable, mildew resistant, waterproof mouse? Are you that much of a slob with slow reflexes that you are constantly spilling things on your mouse? Germaphobe that needs to submerge his mouse in water daily? The mouse does have 800 dpi optical tracking, is compatible with Windows Vista/XP/2000/ME/98SE and has a USB interface.
$17 from USB Geek