Emergency device is available to install as required, in case of power cutting, in case of power cutting, lamp can be self-switched on.
可根据用户要求配装应急装置，当外界断时，灯具自动切换到应急照明状态。
Emergency device is available to install as required, in case of power cutting, in case of power cutting, lamp can be self-switched on.
可根据用户要求配装应急装置，当外界断时，灯具自动切换到应急照明状态。
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