The scope is quite ridiculous and especially do not support walls 30 meters and a building as a barrier and you're done! The transmitter button is not waterproof and therefore should be installed away (ideally in interior). I do not see how claim the IP44 protection? There is no seal, battery compartment is just clipped and could easily fill with water at the button! Otherwise, provided they are pretty close to the transmitter, it works well and set the maximum sound level is good enough. Do not need to change the receiver battery is a definite plus.
