Positioning query: The user edits the letter DW to the machine, and a message containing text or Url will be replied in about 1 minute. Both mobile phones and computers can log in to the link to view the detailed location. Platform Query: Authorized users can use the device ID number and password in the authorized Sms to log in to the website provided by the Sms to query background information. (You can query the machine location, power, trajectory, etc.) Emergency Sos: Edit the uppercase letters Sos of the text message to the alarm. After successful setting, press and hold the S0S button for more than three seconds, and the alarm will directly call the bound number. Call Back: Use your mobile phone or landline to get through the Sim number in the alarm, hear the surrounding sound for 3 seconds, hang up and the setting is successful. When there is a sound of 45 decibels within 10 meters of the alarm, the alarm will automatically dial the set number. Wide Application: Small size, easy to carry. Clear voice and long standby time. Simple operation and convenient installation. It can be used for car antitheft, home, children, elderly, pet monitoring, etc.