Are you fed up with a barking dog? Maybe you are trying to stop a neighbour's dogs barking? None the less, you have a dog that won't stop barking within earshot — then Dazer II hand held device may be the answer.
Small device hand held device when manually activated produces an ultrasonic noise (humans cannot hear) and that dogs do not like. An effective, short and silent activation startles and will stop a barking dog.
Warning - Beware of imitations: what looks like a bargain may turn out to be very expensive useless device, as the low price of an imitation may mean less power, less effectiveness and reduced safety.