Not only just detecting smoke, also monitoring unwanted activities. The Smoke detector covert security cameras were originally developed as a method for monitoring cash registers in retail stores, this camera has evolved into one of the most versatile security cameras available. At home, in the office, warehouse or manufacturing environment, the camera is available in hardwired models with a down view camera in one area, making this the perfect choice for a small or a medium sized business. All of the camera have a 3.7mm 78° field of view pinhole mini lens. This B&W security camera have 420 lines of resolution and low 0.4 lux rating.