This is a TwinMOS 4GB DDR4 2400MHz memory module, specifically designed for desktop computers.
Key Specifications
Based on the label in the image and official data from TwinMOS Technologies, here are the module's core features:
Capacity: 4GB.
Type: DDR4 (PC4-19200).
Bus Speed: 2400 MHz.
Form Factor: U-DIMM (Desktop). Note that it is not for laptops, which typically use smaller SO-DIMM modules.
Voltage: 1.2V, which is the standard for DDR4 and helps reduce power consumption and heat.
CAS Latency: CL17 (The label also specifies "CL 17.0").
Pin Count: 288-pin.