External HDD for Mac. Equipped with a Western Digital 2TB HDD. The Thunderbolt 2 interface with a transfer speed of 20Gbps provides speeds comparable to an SSD. The robust aluminum chassis and external power supply ensure high reliability, and daisy-chain connection is also possible, so those who have Thunderbolt 2 devices in particular may be able to make effective use of their equipment. I used it with an old iMac for Time Machine until a year ago. I think the usage period was about 2 years. ・Main unit ・Included power adapter ・Apple genuine Thunderbolt 2 cable This is a valuable genuine cable, and it's included because you can't connect without it. ・Apple genuine Thunderbolt 2 to Thunderbolt 3 adapter This adapter is important and valuable. This allows it to be used with current iMac/MacBook models. This adapter alone costs about 6,000 yen if new. ※Please note: The interface is Thunderbolt 2 only. There is no USB. It is intended for Mac only, with Thunderbolt 2 or USB-C ports compatible with Thunderbolt 3/4. Although it can be connected to a USB-C port using the adapter, I don't know if it can be used with a Windows PC.