Ugh - no, I wouldn't bother! They only go off when the child is already wet, so what good to they do? What we wound up with was a wet child often awakened from a sound sleep, and then there's the mad panic of the parents trying to rip off the pajamas to unplug the alarm!
We found, through reading and talking to our pediatrician and a pediatric urologist, that you can't "teach" a child to wake up to pee. It is a totally developmental stage, and different kids reach it at different times. The brain has to get the signal that says "Full Bladder" and the alarm does nothing to facilitate that. All you wind up with is an even more exhausted and cranky child. The alarm is actually punitive because it says "If you have not developed naturally, we're going to scare the hell out of you in the middle of the night." It's just as unnatural as yelling at a child who doesn't walk at 9 months but only at 14, or doesn't talk at 12 months but only at 16.
In fact, waking them up in the middle of the night to go pee doesn't do anything either, except to disrupt their sleep cycles and create exhaustion.
What worked for us was keeping him in a diaper or pull up (and they have so many more options now, including larger sizes and extra pads), then putting a waterproof pad on top of the fitted sheet and then a 2nd fitted sheet. If he got wet, we stripped off the wet pajamas and pull up/diaper, doing a quick wipe, and stripping the first sheet and pad. Then he had a clean, dry sheet to go to sleep on.
When he was old enough to go to sleepovers, we revisited the issue with the urologist, and opted for a simple nighttime medication that completely stopped the bedwetting. The urologist explained that he has many patients, usually boys, who just don't get over the nocturnal enuresis (the official term for nighttime bedwetting) until 7 or 10 or even 18. Our son stayed on the meds until around 10, went off, but the problem came back. So he went back on them until 12, then did fine.
I don't LOVE medication when other things work, but this was affecting his life and social relationships - he couldn't have or attend sleepovers, couldn't go to overnight camp, and so on. So we sent him to a friend's house with one little pill in a plain container, and alerted the other parents that he needed to be reminded before bed. The other kids just thought it was an allergy pill and no one knew the difference.
I'm not saying you have to go that route, and you don't say how old the child is. If they are under 6, I'd keep the child in an appropriate absorbent garment, be sure the child understands that it's NOT something he/she can do anything about, and make sure there is no shaming or ribbing from anyone else in the family. It is purely a growth issue and it's more important to highlight all the things the child is already doing "on schedule" - it's also a great tool for educating kids that their friends are doing things in a different order as well, so never to make fun of someone who hasn't grown yet or can't ride a bike yet or still speaks like a little kid or anything else.