Wands are one of the best toys for maximum power as they separate the power source into the handle section while the motor is on a flexible 'neck' so the vibrations are concentrated at the tip and not absorbed by the body/handle as is typical of other toys. 

Our selection are the models we have found to outperform all the rest. Beware, some are teeth rattlingly powerful, the highest setting should only be used in a sound-proof room unless you like intriguing your neighbors.