GF22 is with magnet.Positioning mode: gps/wifi/lbs/agps Battery Type: Li-Polymer, Voltage: 3.7V, Capacity: 180mAh, WH: 0.67WhBody memory: 1024m Positioning time: 20 seconds Battery: polymer (500mah) Standby time: 12 days, working time 4-6 days Charging input: 5vvoltage Working temperature: -20-85 temperature temperature Functions: remote recording, voice control recording, high-definition GPS positioning, real-time tracking, historical track, electronic fence, remote switch, AAP, computer terminal, message operation, help call. GF-22 Engraving range: 80 square meters GSM Frequency Range: gsm850/900/1800/1900mhz Memory support: 16GB Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.