Have any of you ever used the Angel Alert child monitor. I am looking for something to use before our next trip. My boys will be 8 and 5 at the time of our next trip. This monitor can be worn around the neck. You wear one half and the child wears the other half. If they get too far from you, the alarm sounds. Sounded like a good idea, but I would like to find someone that has actually used it before I spend the $35 for one. Thanks for any info!