A-Tech sells this DDR4 UDIMM family under one name across an unusually wide range — single sticks, matched pairs, and four-module sets, at speed grades that stretch from old JEDEC-era ratings up past where most DDR4 kits are sold at all. That breadth is the main thing to know going in: two listings sharing this family name can be quite different parts.
Check 1×8GB, 2400 MT/s and CL17 against each other rather than assuming: this listing is 8GB as 1×8GB, rated 2400 MT/s CL17, and a neighbouring listing under the same name may pair a different module count with a different timing entirely. A four-stick set also loads a board's memory controller harder than a two-stick kit of the same total capacity.
This is DDR4 UDIMM. Not every listing in this family is necessarily the same class of module, so check whether your board calls for standard unbuffered memory or something more specific before ordering.