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双向无线Deltabell模块(上盖和底座分开售卖)
结合扬声器和室内警号
Deltabell警号为你的建筑物增添威慑力
Deltabell-WE MKI和MKII 无线警号电池
(English) The robust Deltabell-WE security sounder provides a visual deterrent and is available in a choice of base and lid colours.