This combo replaces the stock MOFI antenna with these higher end antenna. These new upgraded antenna have a metal base so less chance of it breaking and give between 10-30% better signal and speeds than the stock MOFI antenna. This SIM4-COMBO is the one you need for Canada, USA, UK and many other providers around the world and is currently the best router. This model will work on all providers in the USA and Canada including Sprint and other providers.NOTE: If you plan to use this router with a video camera system or something that needs port forwarding, you will need to get a public IP from your provider.The MOFI4500-4GXeLTE-SIM4-COMBO is a high performance mission critical enterprise rugged metal router with a cellular embedded LTE Advanced (LTE 2) modem that supports LTE bands B1, B2, B3, B4, B5, B7, B8, B12/B17, B20, B25, B26, B30 & B41 made for businesses or customers that want the best signal reception and speed from all provider in Canada and many in USA and around the world Since this router has band 12, customers using the new 700Mhz frequency will get the best performance. This module also supports carrier aggregation which means you will get the fastest speeds possible.Made to work for M2M applications, this router packs a powerful punch with its 2 x 5dBi wifi external antennas that is able to push the wifi signal as far as possible while maintaining the fastest speeds. Also includes 2 x 5dBi 3G/4G/LTE external antennas for the cellular signal that is able to get the strongest signal reception possible. You must have an active service plan from your provider to use.The router creates a secure Wi-Fi® network by supporting the latest wireless security features to prevent unauthorized access. It supports many security options including 64/128-bit WEP, WPA, and WPA2 + more commercial grade security options to ensure that you will be able to secure your Wi-Fi network, regardless of your client devices. In addition, the 3G/4G/LTE mobile router utilizes dual active firewalls (SPI and NAT) to prevent potential attacks from across the Internet.Simply insert your sim card in the side and run the wizard to set up your configuration you require, such as wifi name, password and provider you want to use. If you want to monitor bandwidth use, slow down the internet, create multiple wifi networks, obtain a static public IP address and more, all that is needed is a few clicks. For those that use the router in a critical situation, enable the MOFI Watchdog system that will reboot the router and send alerts if any issue is detected or just want a heart beat signal from the router at a selected interval.