-Use a low light area. Because bacteria require a scan lights flashPhone-The phone must have a camera and Flash, such as 4 or more iphhone.-Supply brand, is acceptable because of the need to use the Flash and camera.
- Used to be a place where there is less light. The scan for bacteria to use light flash from the phone - the phone must have a camera and a flash as iphhone 4 and up - Battery life is reasonable due to the flash and camera.