在过去不长的时间里,在不能布线或采用便携发射机时,人们只能使用短距离防盗和24小时无线安全系统,这是非常必要的,因此,早期的发射机通常是集中报告,而不是单个报告,这就很难甚至不可能消除误报警;另外,发射机电池欠压时没有“警告”。现今,人们愿意采用短距离无线防盗、防火、防劫、紧急和医疗呼 In the less recent time, people can only use short-range anti-theft and 24-hour wireless security systems when cabling can not be used or portable transmitters, which is why early transmitters are usually central to reporting Not a single report, which makes it difficult or impossible to eliminate false alarms; in addition, there is no “warning” when the transmitter battery is under-voltage. Today, people are willing to use short-range wireless security, fire, robbery, emergency and medical call