Some will find it too small, on my side, I find it perfectly adapted to the female anatomy, the vibrations are sufficient, and a simple rotation of the silver portion enables the on / off function, works with a simple little battery current (AAA I think), this fact that we not spend big bucks on batteries overpriced, I personally take the batteries from the TV remote control: P Long battery life, I change the batteries once, after several hours of use (several months). Good value, I highly recommend it!