Ideal protection for your fish and children. Works against herons and cats also protects against theft of your valuable fish and keeps your children from getting too close to the pond. The Superfish Pond Alarm is also suitable as an alarm or deterrent against intruders when camping and fishing, etc. The Pond Alarm is easy to install around a pond with a maximum circumference of 60m. With the optional obtainable set of 4 extra standards, you can protect 100m circumference. The pond alarm is watertight and works non-stop for approximately 14 months on the AA batteries provided. It comes with a full set of instructions.