1.4G module need install a SIM CARD , and it communicates through GSM LTE network without distance restrictions, and can work wherever there is a network to control vehicles.At the same time, there is also Bluetooth built-in. If there is no network signal or SIM card is not charged, the vehicle can be controlled through Bluetooth.

2. You need to buy an extra micro SIM card in your local town,and set APN by Bluetooth to make it connect to internet.

Tips: To enable the GPS module can work with, your micro SIM card monthly data should at least 50MB

The 4G module is with free 1 month subscription since date of activation( not including the SIM card subscription fees that charged by your SIM card operator). After 1 month, you need to pay for the server fees & maintenance fees if you plan to continue to use it. It is about USD26.00/year.And you can pay on the app directly to continue to use it.

4G module has GPS positioning function, but in some countries, the specific location may not be displayed due to map issues 

3.Bluetooth works only about 5-20meters .

4.For  4G and Bluetooth  module ,User can monitor their vehicles with the APP on the phone, no need to take the remote control. Your phone is your car key. You can download the APP after installation completed.