Boeing B737 Cockpit Warning Sounds Equipped with Enhanced Ground Proximity Warning System This is a rare keychain that reproduces the warning sounds used in the actual aircraft cockpit. When you press the button, the warning sound indicated on the button will play. The switch on the back can be set to "ON / OFF". 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