The alarm is fairly cheap (but the aim is not to use it for a long time so no matter): a buzzer shows and two electrodes in the form of snap when the two son touch the current passes and shows beep.
The thread is long enough to pass in the sleeve pajamas and snap the two parts of the snap on the pants of the child.
The urine being conductive when made, current flows and beeeeeeep it sounds continuously.
This alarm has three sound levels that can be chosen only when inserting the battery by touching the electrodes (to change then you must remove the battery). I started with the weakest not wanting to scare my daughter, but nobody heard him, he was immediately switched to the stronger position.
The good idea is to have proposed three covers (butterfly, ladybug, panda) for this watch is what convinced my daughter to wear this rather timid alarm.
I think this product may work on some children who are not too heavy sleep, in our case it is a failure.
Tip: invest in disposable linens if you do not want to change the sheets every night
