Wired fire detector that combined smoke & heat detection together to offer you earlier fire alarm warning. The detector has built-in photo-eletric smoke sensor and heat sensor, it can rapidly response to fire no matter it's flaming fire or smoldering fire. The detector is a 4-wires type fire detector, works with wired security alarm systems. It is equipped with 85dB sounder and LED indicator, making warning sound and LED blinkings as the standalone fire alarm detector. It includes removable bracket for easy ceiling installation.