GL-AR300M16-Ext is a mini travel router for working professionals and a programmable gateway for DIY hobbyists. The router is with storage of 128MB RAM and 16MB Nor Flash, which can be further extended using external USB sticks. There are 2 Ethernet ports, 1 UART, and 1 GPIO available for hardware DIY. It is an ideal portable gateway for IoT development. Wi-Fi is extremely popular but still may not be available anywhere. If you are still using a wired network at hotels or cafes, this mini router can convert it to a wireless network for sharing the Wi-Fi with all your devices. Even in places like cafes or restaurants with Wi-Fi, it is not good to expose your devices to the public network directly. This router converts public Wi-Fi to your Wi-Fi with a firewall and then works as an agent for securer surfing. The agent connects all your devices when switching to a new Wi-Fi. You dont have to input the password for each of your devices. The router is also able to convert your phone tethering, or 3G/4G USB modems into private Wi-Fi. The router is lightweight, pocket friendly, and portable. It can be plugged into any laptop, power bank, or 5V DC adapter for power supply. OpenWRT is pre-installed and backed with a repository of 4000+ software packages. Pre-installed with an OpenVPN client, it works with 30+ VPN service providers.