3、s. Thesystemmainlyimplementsthewireless alarmdistance is whenthehost certaindistancefromthe machineafterthedepartureof thehostwillautomaticallyalarm, and alarm occurs incan theuserthroughthe buttononthe alarm stateis clear, alsofromthemachine alsopresu
4、pposesthe disconnection detection inside, namely themaster-slave communication in normal state, theopportunity willbe a realtimefrom theinside signal uploadtheir tothehost andaccompaniedby light alarm.Analysisofthe datasendingandreceiving theworkprinci