The emergency whistle is made of ABS high strength, lightweight and fail-safe nice whistle works well in any conditions. This 7-in-1 whistle includes a standard high-decibel survival whistle, a compass (accurate and clear ), a thermometer (grasp the current temperature), a survival reflective signaling mirror ( explain current location to rescue personnel), a fire magnifying glass (the sunlight refracted to the dead grass, leaves to produce fire), a high-white light LED flashlight (In the wild without bright light under the premise of emergency use of lighting systems), and a storage canister (write name, address, phone number, blood type). Whistle support customized logo, logo process for silkscreen. The prices for 4000pcs or over are based on ocean shipments.