Here's the link, because yours didn't work:
https://m.dhgate.com/product/electro-se ... 42232.html
Now, before mentioning safety, you should note that this particular device will not actually stimulate the top of the nipple, only the section around it. If you are a hard-core nipple pleasure lover, this device will not cut it. It will be felt around the nipples, but not directly on the nipples. The suction will also be felt mostly around the nipples.
Yes, of course, you will feel some stimulation on the nipple itself, but it is very different than something that touches the outside of the nipples, because then, the pain is much more concentrated to the place where it all matters. That also means, that if you want pain, you will want to crank up the electricity far higher, which will mean that you will feel it mostly on the breasts, as it has muscles, and much less on the actual nipples.
Now, keep in mind, because these are unipolar clamps, and thus, the electricity does not stay at one nipple, but goes from one to the other, the electricity flows from one nipple to the other, passing through your breasts too. As a result, the electricity will contract your breasts muscles too, meaning that the pain is not just the nipples, but your breasts too. In fact, the pain on your breasts with this toy will probably overpower the stimulation on the nipples themselves.
Now that I've said that, lets talk about safety.
As others mentioned and you have read, there are lots of warnings about electricity going through the chest. If you play safe and don't do strange things, you will be fine. TENS units are safe to use when used with common sense. I have a heart condition, and when I started to play with tens on my nipples and I felt my breasts being contracted heavily, I thought I was having problems with my heart. I now learned, that whatever my problem was, was simply due to the fact that I started to tense my muscles. My heart was never affected.
That brings me to the next point. Although the current will not go through your heart with a TENS unit that is used normally (eg not trying to short circuit/boost electricity by using 2 channels to create stimulation for 1 item.) it will affect muscles nearby. If you can't properly relax while you have heavy ESTIM going on, it may cause for a panic attack which can lead to cardiac arrest.
To explain this, we have panic buttons in our body. They're located in our chest and they get activated by tensing up with enough force. If you have a bad posture it is actually possible that you can activate the panic button by using less force in your tensing than normally would be required.
If your panic button is pressed, you will create endorphines, your heartrate will increase, your senses hightened, etc.
Normally, once the panic button is pressed once, and a panic attack is induced, the normal response is a scare response. As a result, we naturally straighten back up and the panic button is depressed.
However, if the panic button is pressed because ESTIM is forcing you in a cramped position, it is possible your panic button is not just pressed, but it is pressed and held. As a result, your heartrate will not just shoot up from 60bpm to 120bpm, but it will shoot up to 145bpm. Any effort in moving will mean that the heart will need to pump more blood than it can, and so every action that requires effort will cause the heartrate to go up where dangarous levels can be reached which eventually will stop the heart.
Unfortunately for me, I know all this from experience, although my experience is not due to ESTIM usage. I actually have a bad posture and by not having done anything about it, at some point anything that got me to cramp my muscles could induce a sustained panic attack. At first, this would last only 10 minutes, but the more serious ones I've had lasted for 4 hours or more. Imagine that you need to go to the toilet (because everything speeds up, and your body will want to get rid of stuff so you will need to pee), and just standing up instantly makes your heartrate go up to 200bpm where you feel becoming dizzy and are about to faint, so you have to sort of crawl to the toilet (or worse). Then when you finally are sitting on the toilet with a heartrate of 145bpm, and you start to pee (which takes considerable effort) and you feel your heartrate shoot up to 200 or more and you are about to faint, and all you can do is squeeze your bladder as hard as you can to stop the peeing, only so you can bring your heartrate down to 145bpm again, just to resume the process until you have emptied your bladder.
Luckily for me, once I realized my problem actually came from my posture, I got myself a back stretcher, and since I started using it, I never had a sustained panic attack anymore. In fact, I got myself an unipolar nipple suction cup from dhgate that I use regularly without any problem, and I crank this one up to the max!!!
Here's the one I have: I recommend it, although it is by far not as powerful as a barry's byte (bi-polar nipple clamps)
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https://m.dhgate.com/product/electrical ... 56694.html
I got myself 2 sets (4 cups) and that is really not a bad thing to do. They are like regular pads, but with suction, for extra effect. Although they have little sponges inside that you can or do not have to wet for interesting effect, I like it more if the pads inside them directly touch my nipples. So I remove the sponges, lick the pads, then apply them to my nipples directly. With this, the pain on my nipples is bigger, though not by much, but enough for me to like it.
You have to note that sometimes suction can escape, but it doesn't seem to be that much of an issue. If suddenly you feel electricity increase on one nipple, then its likely the suction escaped and its now lying loosely on your skin. Just press it in once more so the suction is reapplied.