The functions are easy to control, and it gets right to work with just a push of the power button. There are four wonderful rotating speeds, so it gives you the variety of either reaching your orgasm slow and steady or getting straight to it! The best thing about this item is it literally does all of the work for you. My boyfriend will lay it on his desk, hold it, and just stand there while it gets him off all on its own. It’s a little more difficult to use on a partner because if someone is holding it, it won’t be completely steady, and your penis can touch the side, causing the motor to stop. It’s not very noisy; however, I wouldn’t recommend using it if you’re in a dorm and have a roommate asleep across the room, but if you’re behind closed doors, it will not be heard. It’s USB rechargeable, and the battery has a long lifespan between charges. It is not waterproof.