Features: 1. Operation without distance limitation. You can track the trace your pet on your phone. 2. Muptiple positioning types, help for always pinpoint the real-time location of your pet. No signal missing. Able to check the history footprint of your dog. 3. IP67 grade waterproof design. The pet tracker can be functional even on raining days. 4. Adjustable collar, suitable for different sizes pets. Fits most pets such as puppy, cats. 5. Geo-fence. You can define a safe area around your pet's location and get notified instantly if your pet leaves that area. 6. USB charging mode and low battery alarm. 7. SIM Card not included. The gps dog tracker collar works with 4G LTE 3G WCDMA 2G GSM networks. Please purchase a suitable SIM card to insert to the pet tracker. Package Includes: 1 Piece GPS Collar Specifications: Material: ABS, PVC Color: Black/White Size: Approx.4.9x4.6cm/1.93x1.81in Weight: Approx.130g GSM Frequency: 850/900/1800/1900MHz Positioning Type: GPS+BEIDOU+WIFI+LBS GPS Sensitivity: (-157DB) GPS Accuracy: 5-20M LBS Accuracy: 100-1000M WIFI Accuracy: 10-50M Default Mode: Upload once an hour, standby for 4-5 days Standard Mode: Upload once in 30 seconds, standby for 12-15 hours Working Temperature: -20 to + 55 Battery: Polymer 500 mAh note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!