ElectraClamp BiPolar Electro Clamp

I found them to have just the right strength.

The clamp works as far as being a bi-polar unit. It stays on well without using the conductive gel, but that delivers an uneven 'jolty' shock that's only good for pain-play. When used with the gel, the clamp size & strength causes it to slip and pop off anything you clamp it to. It requires you to clamp it 'around' the skin, which puts the conductive pads more in contact with each other than with the intended body part. I tested it on male and female nipples, fingers, earlobes, tongue, lips, and clit; it popped off all of them when using the gel. The only places it had any success at staying in place when gelled was labia minora and loose scrotum skin. So, unless you're looking for something to use for pinpoint bdsm pain-play, avoid this clamp.

The good: The clamp seems reasonably solid, conducts well, doesn't stick to the skin, doesn't hurt on removal, and doesn't clamp down overly hard. The other: While seemingly solid enough the clamp does sometimes not close completely, creaks on occasion, and the connection points don't quite go all the way in. The assertion that it can "even fit on a thigh" is something I'd certainly like to see done, since not only can it not attach to my thigh it has proven to be difficult to convince it to stay attached to anywhere without some pressing it together hard and hoping it decides not to slip off. All in all, perfectly fine, but I wouldn't go trying to attach it using any sort of lubrication or conductive gel despite recommendations to do so. Feels brilliant, and if it would stay more firmly attached would be a favourite. Alas that it does not. So far, it seems to attach best to a nipple.

they work well if you wrap a rubber band around them!

Easy to use. Good grip.