The Mini Flasher keeps track of joggers, hikers, children, pets and can identify equipment and campsites at night. The flashing LED lamp produces a light so powerful that is visible up to a .50 mile (800 m) for 130 hours. Submersible to 500 feet (150 meters), the Mini Flasher is ideal for anyone to use as a warning or emergency light. This small .068 lbs. (.030 kg) flashlight includes a heavy-duty clip and ring, which can attach to anything, making the Mini Flasher easy to pack or carry when not in use. The Mini Flasher includes 2 coin cell batteries. You break it, we replace it... forever.