Indicator light: the power on indicator light is always on and off for 4 times, and the low battery indicator light flashes quickly. Bind the master control number;Edit SMS 000 with mobile phone and send it to the alarm locator number. Later, the phone will reply a SMS message. The Set;Bind + master control number. Recording separately;Use mobile phone to edit SMS 555 and send it to the alarm locator number. Later, the phone will reply a SMS message.Snd; recording has started. Voice control call back;Edit SMS 666 with mobile phone and send it to the alarm locator number. Later, the phone will reply a SMS message.[DT; sound monitoring has been successfully set, alarm calls are returned]. GPRS positioning query: text message 777 sent to the alarm locator number, later the phone reply to a Chinese geographical location and Google map link, mobile phone open this link will appear location map and text address description, make the location more accurate.