GPS device with SIM. The advantage of these devices is accuracy (per meters) and speed of position update (every 2 seconds). You will always see where your dog moves on the map base. The tax for accuracy and quick position updates is the endurance of this device. The device lasts in operation for about 7 days on one charge (the exception is Tractive XL, which has a duration of 6 weeks). In addition, it is necessary to pay a monthly flat rate of approximately CZK 100 per month for its operation.