NEC's mobile router, Speed WiFi 5G X12 [NAR03], is SIM-free. While there are concerns about data being extracted from Chinese-made products, this one is a reliable Japanese manufacturer. I've used it for about a month. Operation has been confirmed. It works without any problems. In the used market, many have scratches on the corners, but this one has no such damage, only scratches on the surface. I also checked the battery life, and it hasn't changed much from when it was new. I think it lasts long enough. It's rare to find one in this condition, as many have deteriorated batteries from being constantly connected to a cradle. You can also use it with Rakuten Mobile, allowing you to have an unlimited Wi-Fi router at a low cost. I use the same model with a Rakuten Mobile prepaid SIM and get 100GB per month for about 2300 yen. It's comfortable because you can use 5G even at a low price. The 5G area has expanded considerably in the last year, which is very good. I'll be happy to share more information if you'd like. There is also a manual. I will include it if you wish. Since it will be shipped via Nekopos, the box will not be included. If you want the box, it can be sent for an additional 600 yen. A new dedicated case is included. The inside is microfiber, so it stays clean just by being in the case. Only one item is offered at a low price. No price reduction is possible. The main features of the Speed Wi-Fi 5G X12 [NAR03] are as follows: High-speed communication: Supports 5G and Wi-Fi 6, enabling fast and stable wireless communication. Achieves a maximum download speed of 3.9Gbps. It is the first WiMAX mobile router to support SA 5G. Security: Supports the latest Wi-Fi security standard WPA3, enabling stronger security measures. Convenience: Lightweight and compact design for easy portability. Equipped with a 4000mAh battery for long-lasting continuous communication. Supports Wi-Fi connection settings via QR code. By using a separately sold dedicated cradle, wired connection and more stable 5G communication are possible. Other: You can easily manage the device and check data communication usage with the dedicated smartphone app.