SkyScan EWS-PRO is the only professional grade portable lightning detection and early warning device available today. In a rugged self-contained case, it has the electronic sophistication to detect lightning strikes over 40 miles away, and to accurately track a storm’s approach with both its audible horn and its large LED visual alerts. The LED alerts are in four ranges, providing vital information when the storm is moving towards, away or parallel to your position. The audible horn is set by the user to any strike range to make storm tracking easier. Not only does the EWS-PRO allow for an informed decision on when to evacuate an area, but it also indicates when it’s safe to resume outdoor activities.