... -portable,small size -SOS button,voice monitor -real time tracking family GPS Tracker -portable,small size-SOS button,voice monitor -real ... child / Elderly / disabled / pet, Managing personnel and Tracking criminals secretly.family GPS TrackerDetails:Working Based on existing GSM/GPRS(850/900 ... output Battery Chargeable changeable 3.7V 800mAh Li-ion battery family GPS Tracker