This Lightning Detector by AcuRite® provides lightning protection with warnings for cloud-to-ground, cloud-to-cloud and intra-cloud lightning strikes within a 25 mile range. When storms or lightning are in the area, the red and black lightning tracker notifies you with a loud audible alarm, flashing red LED light and text message on the backlit display. It also shows the speed of approaching storms from up to 25 miles away and current strike count. To prevent false detection, this lightning tracker features enhanced interference rejection capabilities. Pocket-sized lightning detector has a built-in, no-slip clip for portability on a keychain or lanyard. It also has a flip-out stand for tabletop use. Works indoors and out. Essential gadget for anyone who enjoys hiking, camping, running, horseback riding or outdoor water sports. Two AAA batteries required (not included).