The WL-R520H4-d is a 3G router manufactured by WLINK. This router, included in the R520 Series, is used to achieve wireless transmission of data and machine to machine connection. It is enclosed in a metal sheet and is equipped with a DUAL SIM back up which makes it compatible with WCDMA or UMTS networks. Moreover, this device has an industrial 32-bit CPU and a hard enclosure allowing it to be used in various applications, indoors or outdoors. It also has a VPN support and synamic route supprt.
With dual SIM feature, WL-R520 series router could backup network between two SIM cards to ensure continual connection.
This router is capable of transmitting data on various broadband such as EDGE/GPRS 2.5 HSPA, HSPA+ and HSDAP 3G Module. In addition, it has electromagnetic interference resistance and heat and radiation endurance. It also has a built-in watch dog allowing multi-link detection and a WAN or WiFi network backup. This router is always online and automatically reboots once disconnected due to external causes.