Coghlans Bear BellAttaches to clothing or pack with a Velcro strap. Movement causes a steady ringing to warn animals of your presence. Magnet in bag eliminates noise. The number one cause of animal attacks is by startling the animal. Most wild animals, including bears and wildcats will generally flee the area when they are aware of human presence. Only when they are quickly approached are they likely to attack. A bear bell simply notifies them well in advance so they are much less tempted to attack a human.