This is a Pi Hat for Raspberry Pi 4 with SATA port which can insert HDD/SSD for extra storage.
Are you worried about your Raspberry Pi 4 that they don't have enough storage? Here is a HAT for Raspberry Pi 4 which you can use the SATA port HDD to extend your Pi storage.
For 3.5inch HDD setups, a standard ATX PSU is required to power the HDD´s and the Raspberry Pi. With 2x 3.5inch HDD´s the PSU should provide at least 60W or more.
For 2.5inch HDD setups, the USB PD/QC power adapter ( >=30W power adapter ) is sufficient to power the disk drives and the Raspberry Pi 4 together. It is important to mention that the power connector on the SATA HAT must be used to power up the NAS with Raspberry Pi 4.
The Dual SATA HAT utilizes two high-performance JMS561 (one JMS561 for the Dual SATA HAT) and provides up to 400MB/s read/write performance with four disks in RAID0 mode.