door alarm meaning in English

[bell] 门铃。

One - chip microprocessor adopted in the mine - door alarm system
单片机在矿井风门报警系统的应用
Our products in wale brand include ir detector , wireless , wired , compatible main unit of alarm , ir fence , ir emitter and receiver magnetic door alarm etc , which are widely used in the military , residential areas , families and factories
系列产品主要包括红外探测器，无线有线兼容式防盗报警主机，红外栅栏，红外对射，门磁开关等，应用在军事小区家庭工厂等诸多领域。在国外品牌垄断的安防行业里，