Sunvalleytek TK-102 GPS/GPRS/GSM Personal Tracker (4-Frequency) Monitoring and SOS feature You can get target's latitude and longitude by SMS or GPRS, and check position by google earth It will send an alert of Geofence to the user when it breaches the restricted area Protect the elder,kid,employee and pet,etc. Will need to insert a working sim card (not included) into the GPS unit