With a loud whistle on one end and a bright LED light on the other end, our Seven-In-One Multi-Function Whistle makes the perfect emergency tool to have with you. It is a tough and durable TPU construction with an integrated compass on one side and a thermometer on the other side. There is also a small waterproof compartment and a removable magnifying glass and signaling mirror. The Seven-In-One Multi-Function Whistle is 4” in overall length and it features a necklace length, lanyard cord for ease of carry or attachment. Get one for your hiking and camping gear, your vehicle and your bugout bag.