Wet spots on the floor, often very difficult to make out, are one of the main reasons for accidents in public areas. Even if a warning sign is in place, the wet area remains a potential safety hazard. Because on the one hand it is hard to make out where the slippery part begins and on the other hand the traditional warning is not easily notable for everyone. Unlike safe zone, which tackles and solves both of these problems. It uses a visual signal to indicate the exact perimeter of the wet zone and also emits an audio warning for the visually impaired.