Ready in Stockgf21 Mini Portable Sos Button GPS Tracker Agps

1. model: gf-21 2. appearance size: about 4*2.6*1.3cm/1.57*1.02*0.51in (length * width * height) 3. machine battery: 500 mah 4. standby time: 12 days, working time 4-6 days 5. positioning accuracy: 10 - 50 meters 6. recording range: 80 square meters