Fixed Temperature Heat Detector, 70°C, Model: AH-9920 This detector is made of high quality material, providing excellent contact despite any environmental interference. This unit completely sealed, its function not affected by humidity, dust or insects. SPECIFICATION Various Types: 2-wire, 3-wire, 4-wire Voltage range : 12 ~ 30V DC Alarm current: 40 mA (2-wire, 3-wire), 30 mA (4-wire) Ambient Temperature: -10ºC ~ +55ºC Weight: 100g Color: white