Features: Emergency Siren Simulator Keychain with realistic alerts, designed for aviation professional and suitable for pilot gear, featurings a small size plastic build for portability. Equipped with a user replaceable button battery (battery not included) and crafted from plastic, this keyring accessory ensures long lasting performances in critical situations. Tailored for aircraft pilots, automotive enthusiasts, and safety traveler seeking emergency signaling solution during commutes or aviation operations. Attach effortlessly to key, flight bags, or car interiors to deliver instantly warning alerts during roadside emergencies, flight training, or aviation safety drill. This aviation safety tool combines light weight durability with intuitive operation, making it essential addition to professional pilot kits and everyday carry essential. Specifications: Component: Plastic Color: Blue, Red Quantity:2 Size:Approx.4cm/1.57''x4cm/1.57'' Package Includes: 2Pcs Warning Simulator note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.