Pulse Toy Pump question: What are pulse toy pumps, and how do they work?

[BuzzBuddies]

I've listened to on vibration toy pumps, but I'm not sure how they purpose. Can anybody clarify their goal and mechanics?

[Mckee]

Are pulse toy pumps primarily used for joy or are there other practical applications?

[Martin]

Where can one find vibration toy pumps, and what should one deem before purchasing one?

[Paxton]

How do pulse toy pumps compare to more types of adult toys in terms of effectiveness and enjoyment?