HPE, Hewlett Packard Enterprise, Proliant microserver Gen10.
4 Bays
2 Ram slots, currently 2X8,16GB PC4 Ram (8 is standard this was upgraded) can take up to 32G 2@16GB
6 USB ports 4-Back, 2 front
optical CD slot, currently empty, uses Proliant 726537-B21 optical drive.
2 Lan ports
2 Diplay ports

Clean and operational, support options available at Hewlet Packard Enterprise website.  https://www.hpe.com/us/en/home.html
Includes Printed Proliant server quick specs for this model from the HPE website.  in order to find informatiion from HP, you need to go to the HPE (enterprise) website not Support.hp.com

Link to Product Specifications HP Enterprise Website:
https://support.hpe.com/hpesc/public/docDisplay?docId=a00008701enw&docLocale=en_US