WN-CS300FR This is a SIM-free Wi-Fi router. It was used at home with Rakuten Mobile for about six months until just before listing, and there were no problems with its operation. It is being listed because I am upgrading to 5G. 【High-Performance 4G LTE】 This I-O DATA WN-CS300FR supports 4G LTE communication and provides a high-speed internet connection of up to 300 Mbps. Stable connections are possible on the 2.4 GHz frequency band. 【Easy Setup】 You can easily set it up by following the included setup guide. It is designed for easy use, even for beginners. - Brand: I-O DATA - Model Number: WN-CS300FR - Communication Method: 4G LTE - Maximum Communication Speed: 300 Mbps - Frequency Band: 2.4 GHz - SIM Size: micro SIM - Operating Temperature Range: 0-35°C - Included Accessories: AC adapter, setup guide