Black box with blinking blue light attached to the side of neighbour’s house

Can anyone identify this black box attached to the side of the neighbour’s house? It has a blinking blue light and faces into our back deck/lounge room so hoping it’s not a camera seeing as we have young children. It is fairly close to his AC system but that’s been here much longer. My partner thinks it might be a noise monitor as our puppy has been barking a lot at night.