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Yard Sentinel Ultrasonic Outdoor Pest and Animal Repellent

Yard Sentinel Ultrasonic Outdoor Pest and Animal Repellent

Product Review (submitted on 17 May 2017):
They're in plague proportions in our suburb.
Does this device emit a sound that humans can't hear ? How long will it last in DC mode ?

ANSWER
The Yard Sentinel is both ultrasonic ( inaudible to humans) and sonic ( audible to humans). You can have the sonic turned on or off and the volume can be adjusted.
It will last up to 2 months in DC mode but this varies depending on the brand of batteries you use. A good option is to purchase rechargeable batteries.