There are 2 editions. Basic and laptop edition/kit. Basic contains just SSD + dvd with some software for migration and maintenance. Basic is slightly cheaper.
Laptop contains same + sata to usb reduction with cable.
So if you want to just put new ssd into laptop/pc you can buy basic. If you also want to migrate data you got 2 options, if you got 2 bays in laptop/pc you can just migrate data with both disks plugged in. If you have just one bay for ssd you should probably get laptop kit to migrate your data before you replace disk wiht your new ssd.
If you get basic you can always buy sata to usb reduction elsewhere.