With the GPS function, it can tell you where your pet is at any time, avoid the loss of your pet. It can record the pet tracking within 3 months. You can even call the pet tracker by Setting the family number. The best choice for you! Excellent Design: it is compact and lightweight, and it will not cause any burden to pets, looks very cute. GPS Function: the pet tracker can locate your pet anywhere, you can see the location and movement of the pet on your phone. Security Fence: you can set an area around locator, alarming immediately when the pet getting in or out of the area. Remote Listening: setting the guardian's cell phone number to keep in Press. Callback Function: setting the callback number. And click the 'sure' button, the pet tracker will automatically call the phone number you set. Water-resistant Design: it is water-resistant and suitable for use in a variety of environments. 2 Location Modes: default mode: upload location every hour, 3 - 5 days standby time; precise mode: upload location every 30 seconds, 12 - 15 hours standby time Network: GSM/GPRS Battery: built-in 500mAh Li-ion battery GPS accuracy: 2 - 5m Storage temperature: -40 - 85 Celsius Working temperature: -20 - 55 Celsius Applicable Dog Breed: Universal Product weight: 0.0960 kg colour:black Material:ABS+ rubber size:65.5*37.7*18.3mm Collar diameter: 6 - 12cm Adjustable collar circumference: 43 - 58cm Package Contents: 1* host 1* silicone case 1* lanyard 1* instruction manual 1* data line Only the above package content, other products are not included. Note: Light shooting 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.