Put in three pieces of AA1.5V batteries. The power consumption of this doorbell is
low so the batteries can be used for 2 months,Install the electronic guest-saluting
doorbell beside the door and turn the switch to music position, the electronic
guest-saluting doorbell will play music automaticly when people come by.
Light control distance is 3-7 meters.
It is advised to use it in the places where there is enough light.
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