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 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.