For professional sourcing, focus on form factor integration. The camera should be seamlessly embedded into common bathroom objects such as wall clocks, towel racks, tissue boxes, or air freshener dispensers. Ensure the lens aperture is pinhole-sized (typically <2mm) and hidden behind one-way glass or specialized smoke-colored acrylic to prevent detection. From a functional standpoint, Motion Detection (PIR sensor) is essential to save storage space and battery life, ensuring the camera only records when activity is sensed.