Ka-bar Knives Ka-bar Emergency Whistle 2-pk W/ Nickel Plated Key Rings. To use clip the whistle to clothing and shake until the nickel-plated ring comes off. Then squeeze the end to emit the whistle. The noise reaches large areas possibly even dowsing livestock bringing help your way. For your safety place one of these in a prominent location such as a vehicle or campfire and make certain those in attendance know where to find you. Ka Bar Emergency Whistles come in packages of two per pack and are made in specialized factories. Specifications for Ka-bar Knives Ka-bar Emergency Whistle 2-pk W/ Nickel Plated Key Rings: Manufacturer: KA-BAR Knives Width: 3.25 in Last Chance: Yes Length: 7.2 in Ka-bar Knives Ka-bar Emergency Whistle 2-pk W/ Nickel Plated Key Rings