The Sona Cruise is designed to give you multiple orgasms without over-stimulating, because it surrounds the clitoris as opposed to touching it. The Sona Cruise has eight settings, is waterproof, and it reserves 20% of the toy's full power during use, and unleashes it automatically when pressed harder against the body.
Promising review: "This thing is amazing! I won't even call it a vibrator, it's more like a sensual massager. I take a long time to climax, and it doesn't always happen. The hard part is finding the right spot. It seems to move around. This thing is like a bloodhound! It finds my spot w/o me even realizing it. Then all I have to do is hold it still (yeah, easy) and it happens! And it goes on for a while, sometimes multiple times! OH, and I've only squirted once in my life, it happened a second time with the Sona Cruise without even getting near the G spot! Thank you, Lelo." —crystal413
Get it from Target for $99 or from Lelo for $129 (three colors).