* Unique Light Labyrinth with High Stability * Adopted CMOS with low power consumption* High Adaptability to the ambient, with Dust proof, moth proof, moisture proof, anti-white light, anti-electromagnetic interferences design * Sound & Flash Alarm, Low Voltage indication, Self-test * Function, network output operated* Manual test, Auto Reset Function* DC 9V Battery Operated* 60 square meter @ 4 meter height* 85dB/m standard level