This is an SSD drive with a 240 GB storage capacity. This model has a 2.5" form factor, the most common for SSD drives.
From OnBuy
Sandisk Plus 240GB Serial ATA III
Gadcet
SanDisk SSD PLUS 240 GB Sata III 2.5 Inch Internal SSD, Up to 530 MB/s, Black, New
This product is also available at 6 unverified stores.