The A135 Key SYSTEM SENSOR RTS451 RTS151 Fire Alarm TEST RESET SHARK KEY DUCT OEM is a fire alarm key manufactured by System Sensor. This unit is specifically designed for testing and resetting fire alarms, providing a reliable solution for maintaining and ensuring the functionality of fire protection systems. With a sleek design and easy-to-use functionality, this key is a essential tool for facility maintenance and safety in various industrial and commercial settings.