Thank you for viewing. This is an NTT-made ISDN terminal adapter, "INS Mate V-70DSU ver1.3". It is a used item, confirmed to be in working order. [Product Contents] ・Main unit (ver1.3 / Serial No. 00643795) ・Power cable ・LAN cable (included) ・3 other parts ・Original box included [Condition] There are stains and yellowing on the exterior due to age. Internal operation has been confirmed, and normal operation of both the power supply and analog ports/S/T points has been verified. Please refrain from purchasing if you are particular about the appearance, as this is a used item. [Specifications] ・ISDN DSU built-in terminal adapter ・Analog 3 ports + S/T point equipped ・Compatible with lines such as INS Net 64 [Please Note] An ISDN line contract is required to use this product. We do not provide support for installation or setup. This item will be delivered as is, so please consider this before purchasing. ⸻ [Shipping] It will be packed in the original box and carefully packaged with cushioning material. ⸻ How about this for those who are using an old ISDN environment, or for maintenance and verification purposes of legacy communication equipment?