Every year more than 900 children die from drowning incidents. This statistics alone should be sufficient for you to take preventive action to safeguard your children from this threat. The POOL ALARM mounts on the edge of your pool and alerts you if there is any motion in the pool. This portable unit is easy to install and operate and is always armed unless you manuall place it in sleep mode. If the alarm is moved or tampered with, it will sound an alarm as well. The POOL ALARM also comes standard with a reciever unit which can be mounted inside your house and up to 200 feet from the main pool sensor. This unit will also activate and emit a loud alarm if the pool sensor is activated. The main Pool Alarm unit requires a nine volt battery (not included) and the remote receiver is powered by an included 12 volt adapter.