... WT-100S1 GPS/GPRS Watch Tracker, GPS Tracker for child/pets/elderlyWT100 GPS watch tracker is a ... GSM module, it provides the cost-effective solution for tracking the children, elder people or those who need ... Two-way talking function, with 3 shortcut buttons for fast calling out 3 phone numbers;7. Geo- ... like design, portalbe, small size.12. WT-100's firmware has the " Cell ID " feature to check by ...