That's from the same company which made/rebadged my GPS tracker light, but 4G and no light. About time they went 4G with products, and thanks for pointing this out because my tracker light will eventually have it's network connetion sacrificed to make room for 6/7/85345G or whatever. Looking at the manual...
(PDF compressed into a .RAR file)
https://www.tkstargps.com/index.php?m=Download&a=down&id=30
... yours works the same way as mine, therefore it should be possible to disable the APN, if you want to avoid monthly internet fees and communicate with it more cheapy using SMS messages exclusively, as I do with my WINNES tracker light. After disabling the APN, you'd lose real-time tracking via the app and website, but still would receive it's location after sending a SMS, or if you have enabled shock detection. Works out ultra cheap if using just SMS, only the cost of SMS messages and the minimum top-up necessary to keep the Giffgaff PAYG phone number alive. Minimum top-up is £10, and I haven't topped up for well over a year - I think provided you send it a text every 179 days or fewer, the telephone number remains yours.