Sonic Pet Trainer Dog/Cat Bark Control Ultrasonic Repeller

Amazon.co.uk Price: £7.55£12.12 (as of 07/02/2018 17:12 PST- Details)

Transmits an ultrasonic sound wave heard by a dog/cat
Suitable for outdoor and indoor, perfect for use in home, hotels, restaurants, courtyards, garages and other places.
Ultrasonic sound waves are a proven way of getting a dogs attention