PetSafe Outdoor Bark Deterrent - PBC19-11794
The unit can be hung up, attached to trees, posts and so on or placed freestanding at a maximum recommended height of up to 1.5 metres. If the unit has to be mounted above 1.5 metres, it should be angled down toward the dog's location so that the speaker faces toward the dog, without intervening physical barriers such as fences (open mesh excepted) between it and the dog.