This tracker can be used to monitor your car, child, pet or assets. It uses the GSM, GPRS frequencies. The GPS tracker’s innovative loop design means it can also be worn on a lanyard or keyring making it easy to carry or it can also hang from a pet collar. The Family GPS Tracker is easy to setup and use. Simply insert a SIM card into the unit and power it on. Next, register your cellphone with the unit by sending a text message to the telephone number associated with the SIM card. The GPS Tracker’s SMS confirms your mobile has been linked and all subsequent commands to the Tracker are facilitated by SMS text messages from your mobile phone and all tracking data is sent via SMS text messages to your cellular.