在声控或振动的节能模式下，3节七号电池可以使用一年半。
In the voice or vibration of the energy-saving mode, the 3 AAA battery can be used more then half year.
打开电池盖，按电池盒上标识的电池极性装入三节七号电池。
Open the battery box, install three AAA batteries according the polarity mark in the battery box.
打开电池盖，按电池盒上标识的电池极性装入三节七号电池。
Open the battery box, install three AAA batteries according the polarity mark in the battery box.
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