Features of Si-R220D Supports ISDN interface (BRI/DSU built-in) Equipped with 4 ports of 10/100BASE-TX (independent) Built-in VPN encryption accelerator - Model: SR-220D - LED indicators: Connection status display ※ We are very sorry, but we do not ship to Okinawa Prefecture. Notes ・Due to amateur inspection, there may be oversights, so please refrain from returns or claims. ・We may use simple packaging. ・Please refrain from purchasing if you are nervous. ・Comments are based on my perspective, so photos of the model number, etc., will take precedence.