Yard Guard for Gates & Doors, Battery Operated, Auto Resets to Standby in 30 Secs. Anyone with kids knows that even the most diligently supervised child can walk in or out of an unlatched gate without being noticed. But equip your gate with a Yard Guard Gate Alarm and a loud 120dB siren will warn you when it has been opened, so you can intervene BEFORE your kids fall into the uncovered pool or run into the busy street. But child safety isn't the only reason you could benefit from this security device. It can also be used to deter burglars or other unwanted trespassers that attempt to gain access to your yard. Also if you have dogs that know how to unlatch the gate, this alarm is great for catching them in the act. This is a must have for every gate and back yard. Hardware Included to Mount on Wooden or Metal Fence and Sliding Doors.