Animal Away is a remote sensing Ultrasonic/Sonic Alarm with Light strobe all built in.
It is trigger by an animals body heat, not just movement in the same way a home alarm works. The animal steps into the PIR beam area (a space of 84m2 with 12m length in front of the sensor) and immediately some very high pitched sounds are emitted and lights flash. When you have it on ultrasonic mode, the pitch of the sounds is not audible with human ears.
Ideal for stopping Possums, Stray dogs and cats or pigeons. Used by lots of gardeners across Australia because it actually works. Dont be tempted to buy the cheap ones on the market. They dont!