These N-type batteries work really well with my OhMiBod vibrator. The OhMiBod no longer uses these types of batteries, for many reasons, including that they are kinda hard to find in normal stores, they don't have as much power as other batteries, and they overall aren't as good as, say, AA or AAA batteries. I don't have to buy these all that often since I don't use my OhMiBod all that often, but I am really glad that EdenFantasys offers them.

Energizer is a really good brand for batteries. There are some things that it's okay to get the cheap one for, and batteries isn't really one of those things. I have found that Energizer batteries last longer than no-name knock-offs. For a little bit higher of a price you can get a better battery that allows your toy to work a little longer and is actually a little better for the toy itself (though this is not proven).

They are inserted just like any other type of battery and have similar disposal directions. Basically it's okay to throw them away with normal trash since big companies like Energizer use less mercury now and it's environmentally okay to throw them away. Rechargeable N-type batteries are even harder to find than the regular ones.

According to Wikipedia, N batteries are commonly used for "small flashlights, remote control door chimes, glucose meters, small desk clocks, wireless microphones, and laser pointers."

Since these batteries are harder to find, it is recommended to take the batteries out of the toys or items you use them for to help make both the batteries and the item to last longer. This is really true for any type of battery but make sure that you do it for these ones since they a bit more harder to find.