Undervoltage Tip: When the operating voltage below 4.8 volts, to open the door when the red light, buzzer alarm, at this time can also open the door to about 200.

• 欠压提示：当工作电压低于4.；8伏，开门时红灯亮，蜂鸣器报警，此时还可以开门200次左右。