Main features: Waterproof IP67, GPS + Beidou positioning, with accuracy of 5m outdoors, WIFI positioning, with accuracy of 30m indoors. Web platform\/ Phone App\/ SMS for positions check, Solar charging automatically when sunlight exists, Removal alarm, Vibration alarm SOS button for urgent help, Loud siren for help\/Ring to find the device, Historical route display\/ Geo-fence Low battery\/ changing alarm, LED prompt light, Step counting Specification: Frequency bands: 4G FDD:Band 1\/2\/3\/5\/7\/8\/20\/28 GPS locating time:30sec with cold boot (open ) 29sec with warm boot (open ) 5sec with hot boot (open ) GPS positioning accuracy:5-15m (open ) WIFI positioning accuracy:15-100m(Under WIFI range) Working temperature:-20 ~ +70 Working humidity:5% ~ 95% RH Battery capacity: 4000mAh Material: Plastic colour: black Package Contents: 1 x Solar GPS Tracker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.