Purchased for a laptop but ended up not needing them. No longer have the packaging they shipped with. Tested and working.

Form Factor - SO-DIMM 260-pin Technology - DDR4 SDRAM Storage Capacity - 8GB, 8GB Registered or Buffered - Unbuffered Data Integrity Check - Non-ECC Memory Speed - 2666 megahertz Memory Specification Compliance - PC4-25600 Supply Voltage - 1.35 volt CAS Latency - CL16