The Dual bullets from Shaki Toys is a hand held controlled double bullet set that has multi-functions and multi-speed. It claims to be waterproof but I would not try it, so submerge at your own risk.

I found a few ways to use these that really can be enjoyable. Just remember that you get what you pay for and while these are great to use, the cords can be either a help or a hindrance.
The controller and the bullets are made of a food-grade plastic that is latex-free, phthalates-free and hypo-allergenic. All three pieces have a velvet touch PU coating that makes insertion comfortable and are nice to the touch. Any lube should be compatible with them as they are plastic.

I found two problems with these: 1) It says that it uses 2-AA batteries and while I had plenty of these in stock, I did not have the 2-AAA that it actually uses. 2) It claims to be waterproof but the bullets plug into the controller and I would not attempt to get water into the plug in or the controller because the battery compartment cover slides on and is NOT waterproof.

That being said, the bullets themselves are quite powerful and have 7 different settings. It comes with no instructions so you have to fidget with the up and down on the controller to figure out what they are.
1) Is its lowest vibe, but it is still pretty strong for the lowest setting
2) A medium vibe, again pretty powerful
3) High vibrations, here it starts getting louder and more powerful
4) Alternates between low and medium vibrations
5) Strong pulse-break-pulse, gets louder
6) Faster pulse, again pretty loud
7) Super vibe, strongest vibration, buzzy and loud
Both bullets share the same pattern that you choose, cannot be operated independently.

The controller is 1 1/8" wide and 4 1/4" long. It has a depth of 5/8" so it can be held or stuck in a pocket quite easily. Each bullet is 5/8" in diameter and 2 1/4" long. You can plug in one or both bullets at a time. The cords on the bullets are 35" long. Because of their small size and the fact that I'm not real secure with the quality of the cords I would not suggest that they be used anally.

Cleaning with warm soapy water is good, just take care not to wash the bullets while they are still attached to the control pack as it is not waterproof. They come in a cardboard box that can be used for storage, just don't pay too much attention to anything that the box says...it lies.

I personally like this for a couple of reasons. For starters they can be controlled by you or your partner. We use them a few different ways. My favorite is inserting one into a cock ring and placing it upside down with the bullet under his penis against his balls while I can use one to stimulate my clit during sex and either one of us can control what function that we want to share.

The cord is also long enough that you can place the bullet in a pair of panties or thongs in the lining and tuck the controller in your back pocket and no one can tell that you have a reason for that smile that you are sporting. I don't know if I would do this out in public as they are a little loud and the lady next to you in the checkout line may wonder why you are buzzing, but for home use it is great.