it's a Beelink Me Mini - an Intel N150 based mini PC. This model has 16GB RAM (soldered) and a 64GB emmc (which I'll soon disable) and 6 NVMe slots.
It's only got a 45W built-in PSU so you have to be careful about your choice of drives (the Lexar nm790 are very low power, but most DRAM-less ones should be OK).
Twin Intel 2.5GB network interfaces too!