Warning sounds from a Boeing B737 cockpit Equipped with the Enhanced Ground Proximity Warning System This is a rare keychain that reproduces the warning sounds used in actual aircraft cockpits. When you press the button, the warning sound indicated on the button will play. There is an "ON/OFF" switch on the back. Use inside an aircraft is prohibited. Size: Approximately 45mm x 45mm x 45mm Batteries: Button cell LR44 x 3 (installed) Types of warning sounds (8 total): 1. MASTER CAUTION 2. A/P (Autopilot Reset) 3. OVERSPEED 4. FIRE WARN 5. PULL UP 6. SINK RATE 7. TERRAIN 8. WINDSHEAR