When your teenager sneaks out of the house, they will generally use either a door or window that is easy enough to sneak out of undetected by you, the parents. To prevent this from happening, you can install door and window alarms that will sound when the door or window is opened so that you’ll be alerted whenever someone exits or enters your home.
You essentially have two options for these alarm systems. You can get a home security system that is controlled by a panel with a code and not give your teenager the code. However, if your teen needs to enter and leave the house when you are not home, say for school, a job, an errand, or going out with friends, they will need that code to disable and enable the alarm as he comes and goes.
If this is the case, another option is to get an alarm system that is controlled remotely by you. This way, you control when the alarm is on, such as when you are going to bed at night. This also prevents your teen from disabling the alarm with the code as they leave and turning it back on when they get home, in which case they are able to get around the whole point of the home security system.
Either way, having door and window alarms is a great way to keep an eye on your teen while you're asleep or otherwise unable to always monitor them. And you don't have to get an entire home alarm system just to monitor doors and windows. While that is probably the most secure way to keep tabs on your teen, you can buy stand-alone door and window sensors. These usually sound an alarm or use an app to alert you when the door or window is opened. If you're looking for general peace of mind, this option is a good alternative to a whole home security system.