Study indicating wet nights associated with low SG of urine. Alarms - clearly superior to medications. Eventually child contracts sphincter without the help of the alarm. Buzzes when pants wet. Buzzer on the collar, sensor on plastic card that fits in pocket of underwear.
Problem is that it takes larger volume to set it off.
More expensive as well. In practice the causes of emotional turmoil may need to be sought. Not usually associated with enuresis. If treatment doesn't work, or if underlying neurological disorder, must refer to urologist for urodynamic studies. Useful in children with small bladder capacity.