This is a single (1) Kingston 4GB DDR4 2666MHz SODIMM memory module, designed primarily for laptops, notebooks, and small-form-factor (Mini-PC) systems. It is characterized by its compact 260-pin SO-DIMM form factor, single-rank (1Rx16) configuration, and 1.2V operating voltage. 

Note: The "SCO" in the part number often indicates a specific manufacturer designation (like "-SCO-11" or "-S6/4"), which usually implies a 1Rx16 organization in Kingston and Samsung models. 

Key Specifications

• Brand: Kingston
• Capacity: Commonly found in 4GB or 8GB modules
• Type: DDR4 SDRAM (Unbuffered Non-ECC)
• Speed: 2666 MHz (PC4-2666V or PC4-21300)
• Form Factor: SO-DIMM (260-pin)
• Rank: 1Rx16 (Single Rank x16)
• Voltage: 1.2V
• CAS Latency: CL19 

Key Features

• Laptop Optimization: Designed for notebooks to enhance multitasking and system responsiveness.
• Power Efficient: Operates at 1.2V, which is the standard for DDR4, helping to maintain better battery life.
• Compatibility: Widely compatible with laptops, mini-PCs, and All-in-One (AIO) computers that support DDR4 SODIMM RAM.
• Installation: Easy to install; "plug-and-play" in most compatible systems. 

Compatibility Warning

• SO-DIMM vs. DIMM: This SO-DIMM (small outline) module is for laptops. It will not fit in a standard desktop computer, which uses the larger 288-pin DIMM modules.
• 1Rx16 Configuration: This RAM is x16 (16-bit) based. While compatible with most modern laptops, it may have slightly lower performance compared to 1Rx8 (8-bit) memory in certain demanding applications, though it is often more power-efficient.
• Check Requirements: Always check your computer’s motherboard specifications to ensure it supports DDR4 2666MHz speed. 

Kingston RAM is generally backed by a lifetime warranty, although some vendor listings may specify shorter periods.