Bark Stop has a special sound selector that lets you choose two different frequencies: Ultrasonic frequencies and Sonic Frequency. In Ultrasonic frequency it can only be heard by dogs not humans.
Delivery time : 3 Working Days. Need to arrange a specific delivery date? Call us to arrange
Warranty : 1 year manufacturer's warranty
Please read all product information and supplied instructions carefully and use the product in accordance with them. Failure to do so may reduce the effectiveness of the product and may invalidate any warranty.
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Speedy delivery is essential on discovery of "unwanted guests". hsd have never let me down. 
