JIMIIoT JC400P 4G Auto-Dual-Kamera-DVR mit Wifi-Video-GPS-Tracking-Fernbedienung
The 4g sim card only needs to support one band is enough. It will automatically detect collisions and save these video files for later so you don't lose them. 4g fdd: b1, b3, b5, b7, b8, b20. 4g tdd: b38, b39, b40, b41 (100m).