Mainly applied to the security of power transformer, electric transmitting line and street lamp line etc. Monitor 3 phase loss voltage and single phase failure of the electric distribution network. With 4 routes of wired input alarm. Send sms to 6 preset mobile phone numbers automatically while alarming. Auto-dial 2 preset phone numbers and monitor the alarm site while alarming. Can connect line-cut/movement/vibration sensors etc., it will alarm when power transformer is damaged or moved. Can connect with the alarm center through gsm network. The system has power-off protection function. When the external power supply is damaged or the power is off, the system can continue to work with a backup battery. Completely sealed aluminum outer shell: waterproof, anti-corrosion, fireproof, strike preventing which are suitable for outdoor installation. This system is mainly applied to the security of power transformer, electric transmitting line and street lamp line etc. Packaging weight: 3.8kg Packaging dimension: 300(l)*138(w)*235(h) mm Standard package included:bl-3000 mainframe x1?wireless digital keypad x1?user manual x1;