a battery powered water proof hand held massager

I am looking for a handheld waterproof massaging device that can be used in water. I am looking for it to be designed and for at least 3 prototypes made and delivered to me (not all together as the aim is to check design and refine it with physical product in my hands). the winner will design it prototype it send it to me re fine the design prototype it refine the design prototype it refine design source a producer organise the production of the device