Used item TP-Link 300Mbps Wireless 3G/4G Portable Router with Access Point/WISP/Router Modes (TL-MR3020), Travel-sized Design, with Mini USB Port, Internal Antenna
TP-Link TL-MR3020 Portable 3G/4G Wireless N Router - Newegg.com
Portable 3G/4G Wireless N Router (TL-MR3020) - Sama Link
How to connect a DVR/NVR to the internet using a TP-TL-MR3020 - Cornick