Firex 2650-560, Universal Duct Smoke Detector IonizationCondition:* New Surplus Stock, No OEM Packaging. As Pictured.Additional Notes:* 24 Volt AC/DC, 115 Volt AC, 230 Volt AC* Alarm Contacts: 2 Form “C” Rated at 12 Amps @ 120 Volt A.C. Resistive* Trouble Contacts: 1 Set Form “C” Rated at 10 Amps @ 115 Volt A.C. Resistive* Air Velocity: 300 to 400ft/min* Ambient Temperate: -5F to 155F (-23C to 68C)* Humidity: 10% to 85% R.H. No Condensation* Material: 18 Gauge Steel Black Box, Clear Plastic Cover* Finish: Gray Paint* Radioactive Element: Americium 241, 0.9 micro curieFirex 2650-560