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/SIM card changing alarm, High power 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.